Perhaps you should try some spelling variations:
trinh ven » trinh van, trinh den, tinh ven
dung cong » dung trong
dien dan » hien dai, vien dai, dien va
gian dan » gian lang
trinh ve » trinh he, trinh va, trinh vi
cong dan » cong san, cong tan, huong dan
gian cau » gian chau, gian cac, gian cam

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 ve) or (trinh ven)) dung cong dan gian cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((dien dan) OR (gian dan)) - hanh ((trinh ve) OR (trinh ven)) dung cong dan gian cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((dien dan) or (gian dan)) - hanh ((trinh ve) or (trinh ven)) dung cong dan gian cau*.