Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
trinh cua » tinh cua, trinh luat, trinh luan
cong cong » cong dong, trong cong, dung cong
cong dan » cong san, cong tan, huong dan
toan cao » toan ban
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo hieu lang - hanh ((trinh cua) OR (trinh quan)) cong cong dan ((toan cao) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - hanh ((trinh cua) OR (trinh quan)) cong cong dan ((toan cao) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo hieu lang - hanh ((trinh cua) OR (trinh quan)) cong cong dan ((toan cao) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - hanh ((trinh cua) OR (trinh quan)) cong cong dan ((toan cao) or (toan tap))*.