Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
tran hoang » tran hong, quan hoang, tran quang
tran dang » tran quang, tranh hang, tran van
thanh cac » hanh cac, thanh bac, thanh ca
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh

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 - canh tranh ((tran dang) OR (tran hoang)) ((cong dan) or (cong tan)) thanh cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - canh tranh ((tran dang) OR (tran hoang)) ((cong dan) OR (cong tan)) thanh cac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - canh tranh ((tran dang) OR (tran hoang)) ((cong dan) or (cong tan)) thanh cac".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - canh tranh ((tran dang) OR (tran hoang)) ((cong dan) or (cong tan)) thanh cac*.