Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
hoc thieu » toc thieu, hoc hien
hanh tang » hanh trang, anh tang, hanh mang
van hang » van khang, van hoang, van thang
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than ban » thanh ban, toan ban, than man
va hang » va nang, va lang, va hanh

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