Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
canh trinh » canh tranh, hanh trinh, canh tinh
hang cong » dang cong, hang nong, bang cong
trinh va » trinh van, trinh vat, trinh ve
cong tac » cong ty
tac phat » tac pham, tam phat, tan phat
phat cau » phan cau, pha cau, phap cau
va hang » van hang, va nang, va lang

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 sang) or (chieu sach)) - canh trinh va hang cong tac phat cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (chieu sach)) - canh trinh va hang cong tac phat cau.
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) or (chieu sach)) - canh trinh va hang cong tac phat cau*.