Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
hanh tang » hanh trang, anh tang, hanh mang
hang cong » dang cong, hang nong, bang cong
cong dan » cong san, cong tan, huong dan
than ban » thanh ban, toan ban, nhuan ban
than man » than ma, thanh san, tran manh
tang va » trang va, tang van, thang va
va hang » van hang, va nang, va lang

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