Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hieu cach » hieu cac, chieu sach, hieu ca
hung tuan » quang tuan, trung tuan, hung thang
hung tran » huong tran, quang tran, hung thang
doc hieu » toc thieu, hoc thieu, hoc hien
doan van » doan va, hoang van, luan van
dan van » dang van, dao van, tan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu cach - manh ((hung tuan) or (hung tran)) thong cong ((dan van) or (doan van)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu cach - manh ((hung tuan) OR (hung tran)) thong cong ((dan van) OR (doan van)) ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu cach - manh ((hung tuan) or (hung tran)) thong cong ((dan van) or (doan van)) ban*.