Perhaps you should try some spelling variations:
khien dong » nhiet dong, dien dong, bien dong
hoc khien » hoc hien, hoc nghien, hoc thieu
trong san » trong cac, cong san, dong san
tong quan » tong luan, luong quan, cuong quan
dung cong » dung trong
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc khien dong - hanh ((trong san) or (((tong quan) or (thong quan)))) dung cong tap toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc khien dong - hanh ((trong san) OR (((tong quan) OR (thong quan)))) dung cong tap toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc khien dong - hanh ((trong san) or (((tong quan) or (thong quan)))) dung cong tap toan ban*.