Perhaps you should try some spelling variations:
trinh vatn » trinh van, trinh han, trinh san
nhung cong » dung cong, thong cong, hang cong
chinh chau » chinh cho, chinh phu, minh chau
trinh vat » trinh van, trinh luat, sinh vat
chinh cau » chinh ca, chinh can, chinh tai
hoc tiep » hoa tiep, hoc tieu, hoc tien
cong tan » cong tac, cong san, cong thanh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc tiep can - hanh ((trinh vat) or (trinh vatn)) nhung cong tan ((chinh cau) OR (chinh chau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tiep can - hanh ((trinh vat) OR (trinh vatn)) nhung cong tan ((chinh cau) OR (chinh chau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc tiep can - hanh ((trinh vat) or (trinh vatn)) nhung cong tan ((chinh cau) OR (chinh chau))".
• Adding a wildcard symbol may retrieve word variants: hoc tiep can - hanh ((trinh vat) or (trinh vatn)) nhung cong tan ((chinh cau) OR (chinh chau))*.