Perhaps you should try some spelling variations:
trinh vatn » trinh van, trinh han, trinh san
nhung cong » dung cong, thong cong, hang cong
hoc tieng » hoc hien
trinh vat » trinh van, trinh luat, sinh vat
cong tac » cong ty
tac chan » tac chuan, tac can, tac chon
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 tieng anh - hanh ((trinh vat) or (trinh vatn)) nhung cong tac chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tieng anh - hanh ((trinh vat) OR (trinh vatn)) nhung cong tac chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc tieng anh - hanh ((trinh vat) or (trinh vatn)) nhung cong tac chan cau*.