Perhaps you should try some spelling variations:
"su hoc nganh cong khi đong luc" » "su hoc nhanh chong khi đong luc", "su hoc nhanh cong khi đong luc", "su hoc nganh khong khi đong luc", "su hoc nganh co khi đong luc", "su hoc nganh cong ha đong luc", "tu hoc nganh cong khi đong luc", "du hoc nganh cong khi đong luc", "so hoc nganh cong khi đong luc"
"su hoan thanh cong thai đong luc" » "su hoang thanh cong thai đong luc", "su ban thanh cong thai đong luc", "su van thanh cong thai đong luc", "su hoan thanh cong hai đong luc", "su hoan thanh hong thai đong luc", "su hoan thanh cong thanh đong luc", "su han thanh cong thai đong luc", "vu hoan thanh cong thai đong luc", "thu hoan thanh cong thai đong luc"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("su hoc nganh cong khi đong luc") or ("su hoan thanh cong thai đong luc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("su hoc nganh cong khi đong luc") OR ("su hoan thanh cong thai đong luc")).
• Removing quotes may allow a broader search: (( su hoc nganh cong khi đong luc ) or ( su hoan thanh cong thai đong luc )).
• Adding a wildcard symbol may retrieve word variants: (("su hoc nganh cong khi đong luc") or ("su hoan thanh cong thai đong luc"))*.