Perhaps you should try some spelling variations:
trinh van » trinh han, trinh quan, trinh toan
dung cong » dung trong
dien dan » hien dai, vien dai, dien va
gian dan » gian lang
trinh va » trinh vat, trinh ve, trinh vi
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 ((dien dan) or (gian dan)) - hanh ((trinh va) or (trinh van)) dung cong dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((dien dan) OR (gian dan)) - hanh ((trinh va) OR (trinh van)) dung cong dan chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((dien dan) or (gian dan)) - hanh ((trinh va) or (trinh van)) dung cong dan chan cau*.