Perhaps you should try some spelling variations:
nang luong » nang song
luong cong » dung cong, trong cong, cong cong
hanh tran » hanh trang, thanh tran, thanh trang
hanh tram » hanh tam, hanh trang, thanh tran
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai 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: ((25 trieu) OR (30 trieu)) tinh - ((hanh tran) OR (hanh tram)) nang luong cong tap toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((25 trieu) or (30 trieu)) tinh - ((hanh tran) OR (hanh tram)) nang luong cong tap toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((25 trieu) or (30 trieu)) tinh - ((hanh tran) OR (hanh tram)) nang luong cong tap toan cau*.