Perhaps you should try some spelling variations:
thien danh » thien anh, thien dang, thien thanh
chieu xanh » chieu sach, chieu sang, chieu tinh
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 dan » cong san, cong tan, huong dan
phan cau » phan dau, phan cac, phan lap
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 ((thien danh) or (chieu xanh)) - canh trinh va hang cong dan ((phan cau) OR (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien danh) OR (chieu xanh)) - canh trinh va hang cong dan ((phan cau) OR (phan tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien danh) or (chieu xanh)) - canh trinh va hang cong dan ((phan cau) OR (phan tu))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien danh) or (chieu xanh)) - canh trinh va hang cong dan ((phan cau) OR (phan tu))*.