Perhaps you should try some spelling variations:
nhieu tang » chieu sang, hieu lang, nhiet nang
chieu sach » chinh sach, chiet tach, chieu sang
canh trinh » canh tranh, hanh trinh, canh tinh
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 hanh
va lang » va nang, hoa 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 ((nhieu tang) or (chieu sach)) - canh trinh ((va hang) OR (va lang)) cong tac phat cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((nhieu tang) OR (chieu sach)) - canh trinh ((va hang) OR (va lang)) cong tac phat cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((nhieu tang) or (chieu sach)) - canh trinh ((va hang) OR (va lang)) cong tac phat cau".
• Adding a wildcard symbol may retrieve word variants: doi ((nhieu tang) or (chieu sach)) - canh trinh ((va hang) OR (va lang)) cong tac phat cau*.