Perhaps you should try some spelling variations:
trinh vatn » trinh van, trinh han, trinh san
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
trinh vat » trinh van, trinh luat, sinh vat
tan chinh » tai chinh, lan chinh, van chinh
chinh cau » chinh chau, chinh ca, chinh can
hoc dieu » hoc hien
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 dieu) OR (hoc thieu)) dan - hanh ((trinh vat) or (trinh vatn)) nhung cong tan chinh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc dieu) OR (hoc thieu)) dan - hanh ((trinh vat) OR (trinh vatn)) nhung cong tan chinh cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc dieu) OR (hoc thieu)) dan - hanh ((trinh vat) or (trinh vatn)) nhung cong tan chinh cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc dieu) OR (hoc thieu)) dan - hanh ((trinh vat) or (trinh vatn)) nhung cong tan chinh cau*.