Perhaps you should try some spelling variations:
theo dieu » theo tieu, theo chieu, thuoc dieu
tang chua » tang cua, tranh chua, tang khu
nang cong » nang song, dang cong, bang cong
cong dan » cong san, cong tan, huong dan
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap
tang ha » lang ha, tang ma, trung ha

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: theo dieu hanh - hanh ((tang chua) OR (tang ha)) nang cong dan ((toan cau) OR (toan cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo dieu hanh - hanh ((tang chua) OR (tang ha)) nang cong dan ((toan cau) or (toan cao))~".
• Adding a wildcard symbol may retrieve word variants: theo dieu hanh - hanh ((tang chua) OR (tang ha)) nang cong dan ((toan cau) or (toan cao))*.