Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
hanh tranh » canh tranh, hanh trinh, hanh trang
hieu lang » hieu quang, nhieu tang, hieu van
nang cong » nang song, dang cong, bang cong
van thanh » ban thanh, van tuan
tranh va » tranh van, trang va, trinh va
van toan » van tuan, van tan, manh toan
va nang » van nang, da nang, cam nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sang) or (hieu lang)) - hanh tranh va nang cong ((van toan) OR (van thanh)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sang) OR (hieu lang)) - hanh tranh va nang cong ((van toan) OR (van thanh)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sang) or (hieu lang)) - hanh tranh va nang cong ((van toan) OR (van thanh)) ban".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sang) or (hieu lang)) - hanh tranh va nang cong ((van toan) OR (van thanh)) ban*.