Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hanh phang » khanh phong, nhanh thang, thanh thang
nhung cong » dung cong, thong cong, hang cong
toc thien » toc thieu, ton thien, duoc thien
hanh phan » thanh phan, anh phan, hanh han
cua nhung » va nhung
tac toan » tap toan, hach toan, tich toan
tam toan » tap toan, tam than, pham toan

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 phang) or (hanh phan)) cua nhung cong ((tac toan) OR (tam toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thien hach - ((hanh phang) OR (hanh phan)) cua nhung cong ((tac toan) OR (tam toan)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc thien hach - ((hanh phang) or (hanh phan)) cua nhung cong ((tac toan) OR (tam toan)) tap".
• Adding a wildcard symbol may retrieve word variants: toc thien hach - ((hanh phang) or (hanh phan)) cua nhung cong ((tac toan) OR (tam toan)) tap*.