Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
thanh cung » thanh cuong, thanh cong, thanh tung
hoac khong » hoa khong, hoc khong, hay khong
hoc thien » hoc hien, hoc thieu, hoc thiet
cung hoac » cong hoa, dung hoc, ung hoa
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
toan cao » toan ban, toan tap

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 cung hoac khong ((cong tan) OR (cong san)) toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thien hach - thanh cung hoac khong ((cong tan) OR (cong san)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - thanh cung hoac khong ((cong tan) OR (cong san)) toan cao*.