Perhaps you should try some spelling variations:
thieu tach » chiet tach, chieu sach, hieu cach
thien hach » thien thanh, hien hanh
thanh tung » thanh cong
phong sach » phong cach, duong sach, cong sach
nang cong » nang song, dang cong, bang cong
tan phong » tran phong, tuan phong, van phong
cong tan » cong tac, cong san, cong thanh
tung va » trung va, tuong va, dung va
va nang » van nang, da nang, cam nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu tach) or (thien hach)) - thanh tung va nang cong tan phong sach~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu tach) OR (thien hach)) - thanh tung va nang cong tan phong sach.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu tach) or (thien hach)) - thanh tung va nang cong tan phong sach*.