Perhaps you should try some spelling variations:
trinh thuat » trinh luat, trinh thiet, trinh chat
trinh thuc » trinh tu, trinh thi
nhung cong » dung cong, thong cong, hang cong
chi xanh » chi anh, chi danh, chi hanh
cong tan » cong tac, cong san, cong thanh
tran huu » tran duc
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi xanh - hanh ((trinh thuat) OR (trinh thuc)) nhung cong tan tran huu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chi xanh - hanh ((trinh thuat) OR (trinh thuc)) nhung cong tan tran huu".
• Adding a wildcard symbol may retrieve word variants: doi chi xanh - hanh ((trinh thuat) OR (trinh thuc)) nhung cong tan tran huu*.