Perhaps you should try some spelling variations:
"vu khach nganh cong khi đong luc" » "vu khach nhanh chong khi đong luc", "vu khach thanh cong khi đong luc", "vu khanh nganh cong khi đong luc", "vu khac nganh cong khi đong luc", "vay khach nganh cong khi đong luc", "vu khach nganh cong thai đong luc", "vu khach nganh khong khi đong luc", "vu khach nganh co khi đong luc"
"su sach hoat dong khi đong luc" » "su sinh hoat dong khi đong luc", "su tich hoat dong khi đong luc", "su sach dat dong khi đong luc", "su sach hoat duong khi đong luc", "su sach hoat dong thi đong luc", "su sach hoat dong chi đong luc", "so sach hoat dong khi đong luc", "vu sach hoat dong khi 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: (("vu khach nganh cong khi đong luc") or ("su sach hoat dong khi đong luc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("vu khach nganh cong khi đong luc") OR ("su sach hoat dong khi đong luc")).
• Removing quotes may allow a broader search: (( vu khach nganh cong khi đong luc ) or ( su sach hoat dong khi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (("vu khach nganh cong khi đong luc") or ("su sach hoat dong khi đong luc"))*.