Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
theo hieu » theo chieu, thien hieu, thuc hieu
hanh tang » hanh trang, anh tang, hanh tung
hanh mang » nhanh mang, hanh trang, nhanh lang
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo hieu) OR (theo tieu)) lang - ((hanh tang) OR (hanh mang)) va nhung cong dan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo hieu) OR (theo tieu)) lang - ((hanh tang) or (hanh mang)) va nhung cong dan toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((theo hieu) OR (theo tieu)) lang - ((hanh tang) or (hanh mang)) va nhung cong dan toan cau*.