Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
nhung cong » dung cong, thong cong, nhung don
toc thien » toc thieu, ton thien, duoc thien
hanh hang » thanh hang, hang hang, hanh mang
hang cong » dang cong, hang nong, bang cong
hanh han » hanh nhan, hanh phan, hanh san
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: toc thien hach - ((hanh hang) or (hanh han)) cua ((nhung cong) OR (hang cong)) tac toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thien hach - ((hanh hang) OR (hanh han)) cua ((nhung cong) OR (hang cong)) tac toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc thien hach - ((hanh hang) or (hanh han)) cua ((nhung cong) OR (hang cong)) tac toan tap".
• Adding a wildcard symbol may retrieve word variants: toc thien hach - ((hanh hang) or (hanh han)) cua ((nhung cong) OR (hang cong)) tac toan tap*.