Perhaps you should try some spelling variations:
doi chieu » doi chi, ho chieu, mot chieu
cong vang » cong lang, cong quang, cong ngang
nhanh cau » nhanh cay, thanh chau, nhanh ha
doc hieu » toc thieu, hoc thieu, hoc hien
tranh va » tranh van, trang va, trinh va
va thong » va thuong, va phuong, he thong
cong van » cong san, song van, cong tan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (doc hieu)) sang - canh tranh va thong ((cong van) or (cong vang)) nhanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) sang - canh tranh va thong ((cong van) OR (cong vang)) nhanh cau.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doc hieu)) sang - canh tranh va thong ((cong van) or (cong vang)) nhanh cau*.