Perhaps you should try some spelling variations:
nhanh dong » hanh dong, nhanh chong, anh dong
hieu tinh » chieu tinh, lieu tinh, kieu tinh
dong chen » dong chan, dong che, dong chuyen
long cong » luong cong, tong cong, long tong
cong cong » cong dong, trong cong, dung cong
doc hieu » toc thieu, hoc thieu, hoc hien
san van » tan van, luan van, tran 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 tinh - nhanh dong chen ((long cong) or (cong cong)) san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tinh - nhanh dong chen ((long cong) OR (cong cong)) san van ban*.