Perhaps you should try some spelling variations:
chiet tach » chieu sach
chieu xanh » chieu sach, chieu sang, chieu tinh
tang nguon » tang nguyen, dung nguon, bang ngon
tranh cai » tranh cac, trinh cai, tranh chap
nguon van » nguon von, nguoi van, nguyen van
cai tang » cai trang, cao tang, ca tang
van tan » van tuan, van ban, van tai
tan cau » toan cau, van cau, tan ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chiet tach) or (chieu xanh)) - canh tranh cai tang nguon van tan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chiet tach) OR (chieu xanh)) - canh tranh cai tang nguon van tan cau.
• Adding a wildcard symbol may retrieve word variants: doi ((chiet tach) or (chieu xanh)) - canh tranh cai tang nguon van tan cau*.