Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thieu tach » thien hach, chiet tach, chieu sach
thanh tung » thanh cong
cong thanh » dong thanh, cong trinh, cong tan
nang cong » nang song, dang cong, bang cong
thanh hoa » thanh pho
tung va » trung va, tuong va, dung va
va nang » van nang, da nang, cam nang
hoa cac » hoa chat, chon cac

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 thanh)) - thanh tung va nang cong thanh hoa cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu tach) OR (thien thanh)) - thanh tung va nang cong thanh hoa cac.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu tach) or (thien thanh)) - thanh tung va nang cong thanh hoa cac*.