Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
khong cong » thong cong, khong cang, chong cong
trinh cua » tinh cua, trinh luat, trinh luan
chi xanh » chi anh, chi danh, chi hanh
cong tan » cong tac, cong san, cong thanh
toan cao » toan ban
toan tap » toan ban
doi chi » doi khi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi xanh - hanh ((trinh cua) OR (trinh quan)) khong cong tan ((toan cao) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chi xanh - hanh ((trinh cua) OR (trinh quan)) khong cong tan ((toan cao) or (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: doi chi xanh - hanh ((trinh cua) OR (trinh quan)) khong cong tan ((toan cao) or (toan tap))*.