Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
hanh tang » hanh trang, hanh mang, hanh tung
anh tang » anh bang, anh dang, anh nang
cong tac » cong ty
va cong » tai cong, cua cong
tac ran » tac can, tac van, tac quan
ran cau » van cau, ban cau, can cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu sach - ((hanh tang) OR (anh tang)) ((va cong) or (he thong)) cong tac ran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - ((hanh tang) OR (anh tang)) ((va cong) OR (he thong)) cong tac ran cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - ((hanh tang) OR (anh tang)) ((va cong) or (he thong)) cong tac ran cau".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - ((hanh tang) OR (anh tang)) ((va cong) or (he thong)) cong tac ran cau*.