Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
hanh trinh » canh tranh, hanh chinh
ve thong » he thong, va thong, ve chong
ve phong » va phong, van phong, mo phong
cong tac » cong ty
tac trai » tam trai, khac trai, rac thai
trai cao » tai cao, thai cao, trai chan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sach) or (chieu sang)) - hanh trinh ((ve thong) or (ve phong)) cong tac trai cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (chieu sang)) - hanh trinh ((ve thong) OR (ve phong)) cong tac trai cao.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (chieu sang)) - hanh trinh ((ve thong) or (ve phong)) cong tac trai cao*.