Perhaps you should try some spelling variations:
dang nguong » dung nguon, dang thuong, tang nguon
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
nguong dan » huong dan
hanh tang » hanh trang, hanh mang, hanh tung
tran manh » tran minh, tran thanh, tran van
anh tang » anh bang, anh dang, anh nang
cua dang » cua cong, cua ban
than man » than ma, thanh san, than phan

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)) cua dang nguong dan ((than man) or (tran manh))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - ((hanh tang) OR (anh tang)) cua dang nguong dan ((than man) OR (tran manh)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - ((hanh tang) OR (anh tang)) cua dang nguong dan ((than man) or (tran manh))".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - ((hanh tang) OR (anh tang)) cua dang nguong dan ((than man) or (tran manh))*.