Perhaps you should try some spelling variations:
thien danh » thien anh, thien dang, thien thanh
canh trinh » canh tranh, hanh trinh, canh tinh
nhung cong » dung cong, thong cong, hang cong
trinh va » trinh van, trinh vat, trinh ve
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau

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 (trieu tinh)) - canh trinh va nhung cong dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien danh) OR (trieu tinh)) - canh trinh va nhung cong dan chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thien danh) or (trieu tinh)) - canh trinh va nhung cong dan chan cau*.