Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hoc thien » hoc hien, hoc thieu, hoc thiet
thanh qua » thanh quan, thanh qui, hanh qua
tranh cua » doanh cua, manh cua
dung cong » dung trong
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan ban » van ban

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 - canh ((thanh qua) or (tranh cua)) dung cong tac toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - canh ((thanh qua) OR (tranh cua)) dung cong tac toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - canh ((thanh qua) or (tranh cua)) dung cong tac toan ban*.