Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
lieu tinh » trieu tinh, diep tinh
bien tinh » bi tinh, yen tinh, diep tinh
lanh manh » lanh tranh, lan anh, van manh
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van 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: doi ((lieu tinh) OR (bien tinh)) - ((canh tranh) or (lanh manh)) va nhung cong tan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((lieu tinh) OR (bien tinh)) - ((canh tranh) OR (lanh manh)) va nhung cong tan toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((lieu tinh) OR (bien tinh)) - ((canh tranh) or (lanh manh)) va nhung cong tan toan tap".
• Adding a wildcard symbol may retrieve word variants: doi ((lieu tinh) OR (bien tinh)) - ((canh tranh) or (lanh manh)) va nhung cong tan toan tap*.