Perhaps you should try some spelling variations:
"su sach hanh dong khi đong luc" » "su sach danh dong khi đong luc", "su sach han dong khi đong luc", "su sac hanh dong khi đong luc", "su sach anh dong khi đong luc", "su sach ha dong khi đong luc", "su sach hanh duong khi đong luc", "su sach hanh cong khi đong luc", "su sach hanh dong thi đong luc", "so sach hanh dong khi đong luc", "vu sach hanh dong khi đong luc"
"su cac nganh ky thi đong luc" » "su hoc nganh ky thi đong luc", "su cac nganh y thi đong luc", "su cac nganh xay thi đong luc", "su cac hanh ky thi đong luc", "tu cac nganh ky thi đong luc", "su cao nganh ky thi đong luc", "su can nganh ky thi 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 sach hanh dong khi đong luc") or ("su cac nganh ky thi đong luc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("su sach hanh dong khi đong luc") OR ("su cac nganh ky thi đong luc")).
• Removing quotes may allow a broader search: (( su sach hanh dong khi đong luc ) or ( su cac nganh ky thi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (("su sach hanh dong khi đong luc") or ("su cac nganh ky thi đong luc"))*.