Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
hanh trang » thanh trung, canh tranh, hanh trinh
hang cong » dang cong, hang nong, bang cong
thanh lap » thanh san, phan lap, thanh hai
trang va » tran van, hang va
cong dan » cong san, cong tan, huong dan
than cua » nhan cua, thai cua, ban cua
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: hoc ((chieu sach) OR (chieu sang)) - hanh trang va hang cong dan ((than cua) or (thanh lap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chieu sang)) - hanh trang va hang cong dan ((than cua) OR (thanh lap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) OR (chieu sang)) - hanh trang va hang cong dan ((than cua) or (thanh lap))".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) OR (chieu sang)) - hanh trang va hang cong dan ((than cua) or (thanh lap))*.