Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
doc diep » duoc dien, ngoc diep, dac diem
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
tung ve » tung le, tung va, trung va
dung ve » dung va, dung he, dung de

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc diep tinh - thanh ((tung ve) OR (dung ve)) nhung cong tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc diep tinh - thanh ((tung ve) OR (dung ve)) nhung cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: doc diep tinh - thanh ((tung ve) OR (dung ve)) nhung cong tac toan cau*.