Perhaps you should try some spelling variations:
theo chieu » ho chieu, theo chu, thi chieu
lang cong » dang cong, bang cong, hang cong
tang van » dang van, hoang van, trong van
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
tang va » trang va, thang va, tang vat
than ma » than man, than va, khan ma

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