Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu sang » hieu quang, nhieu tang, hieu van
hieu lang » hieu quang, nhieu tang, hieu van
song manh » song hanh, song minh, song xanh
manh toan » thanh toan, anh tuan, tinh toan
tranh va » tranh van, trang va, trinh va
toan cau » toan cao, toan ban, toan tap
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: doc ((((hieu sang) OR (chieu sang))) or (hieu lang)) - canh tranh va nang song manh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((((hieu sang) OR (chieu sang))) OR (hieu lang)) - canh tranh va nang song manh toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((((hieu sang) OR (chieu sang))) or (hieu lang)) - canh tranh va nang song manh toan cau*".