Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thieu tach » thien hach, chiet tach, chieu sach
thanh dung » thanh duong, thanh tung, thanh hung
cong thanh » dong thanh, cong trinh, cong tan
dang cong » dung cong
thanh tho » thanh thao, thanh pho, thanh ho
dung van » duong van, dung va, dang van
van dang » van dong, van dung, van nang
tho cac » cho cac, tho ca, thong 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 dung van dang cong thanh tho cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu tach) OR (thien thanh)) - thanh dung van dang cong thanh tho cac.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu tach) or (thien thanh)) - thanh dung van dang cong thanh tho cac*.