Perhaps you should try some spelling variations:
chau tinh » cuu tinh, ha tinh, cua tinh
lieu tinh » trieu tinh, diep tinh, bien tinh
tranh van » tran van, trinh van, thanh van
nang cong » nang song, dang cong, bang cong
van nang » van quang, van ban, van dong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chau tinh) or (lieu tinh)) - canh tranh van nang cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chau tinh) OR (lieu tinh)) - canh tranh van nang cong dan than cau.
• Adding a wildcard symbol may retrieve word variants: doi ((chau tinh) or (lieu tinh)) - canh tranh van nang cong dan than cau*.