Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
nhung cong » dung cong, thong cong, hang cong
hoc thien » hoc hien, hoc thieu, hoc thiet
tinh cua » trinh cua, sinh cua, tinh chat
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan tap » toan 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 - hanh ((tinh cua) or (trinh luat)) nhung cong tac toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - hanh ((tinh cua) OR (trinh luat)) nhung cong tac toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - hanh ((tinh cua) or (trinh luat)) nhung cong tac toan tap*.