Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
thong cong » trong cong, tong cong, thong thong
hoc thien » hoc hien, hoc thieu, hoc thiet
cau thong » sau thong, cau thang, cau trong
cong cau » cong cu, cong chuc, thong cau
cong van » cong vang, cong san, song van
than cao » toan cao, thai cao, than sao
than cap » khan cap, thanh lap, thanh 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 thien hach - thanh cong cau thong cong van ((than cao) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - thanh cong cau thong cong van ((than cao) OR (than cap)).
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - thanh cong cau thong cong van ((than cao) or (than cap))*.