Perhaps you should try some spelling variations:
theo chiet » theo chieu, thep thiet
chiet tach » chieu sach
nang cong » nang song, dang cong, bang cong
trang va » tran van
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chiet tach - hanh ((trang va) OR (hang va)) nang cong dan than cau~".
• Adding a wildcard symbol may retrieve word variants: theo chiet tach - hanh ((trang va) OR (hang va)) nang cong dan than cau*.