Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
hoc thien » hoc hien, hoc thieu, hoc thiet
thien anh » thien danh, tien anh, thien thanh
van khang » van khanh, van thanh, van quang
van thang » van thanh, van hang, van than
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
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 anh - canh trinh ((van khang) or (van thang)) ((cong dan) or (cong san)) chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien anh - canh trinh ((van khang) OR (van thang)) ((cong dan) OR (cong san)) chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thien anh - canh trinh ((van khang) or (van thang)) ((cong dan) or (cong san)) chan cau*.