Perhaps you should try some spelling variations:
trinh ven » trinh van, trinh den, tinh ven
dung cong » dung trong
tien anh » tieng anh, tien manh, tien thanh
dien anh » tieng anh, dien dan
trinh ve » trinh he, trinh va, trinh vi
cong tan » cong tac, cong san, cong thanh
tan chan » dan chan, ban chan, can chan
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 ((tien anh) or (dien anh)) - hanh ((trinh ve) or (trinh ven)) dung cong tan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((tien anh) OR (dien anh)) - hanh ((trinh ve) OR (trinh ven)) dung cong tan chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((tien anh) or (dien anh)) - hanh ((trinh ve) or (trinh ven)) dung cong tan chan cau*.