Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
doc diep » duoc dien, ngoc diep, dac diem
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cau » toan cao, toan ban, toan tap
tung ve » dung ve, tung le, trung va
tung va » trung va, tuong va, dung va

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