Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
luan trong » quan trong, luat trong, luan tuong
lieu tinh » trieu tinh, diep tinh, bien tinh
anh tang » anh bang, anh dang, anh nang
cong tan » cong tac, cong san, cong thanh
tran cao » toan cao, tran chau, trang cho
so lieu » so dieu

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: so lieu tinh - ((hanh trinh) OR (anh tang)) luan trong cong tan tran cao~.
• Adding a wildcard symbol may retrieve word variants: so lieu tinh - ((hanh trinh) or (anh tang)) luan trong cong tan tran cao*.