Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh han
thong cong » trong cong, tong cong, thong thong
hieu manh » chieu xanh, hieu nganh, dieu hanh
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong san, cong tan, huong dan
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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: doc hieu manh - hanh ((trinh quan) OR (trinh luat)) thong cong dan ((toan cau) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu manh - hanh ((trinh quan) OR (trinh luat)) thong cong dan ((toan cau) or (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: doc hieu manh - hanh ((trinh quan) OR (trinh luat)) thong cong dan ((toan cau) or (toan tap))*.