Perhaps you should try some spelling variations:
khoa sach » hoc sach
tranh cua » doanh cua
dong cong » duong cong, dung cong, dang cong
khi sach » khi sac, khau sach, khoe sach
manh cua » doanh cua, ban cua
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cap » khan cap, thanh lap, thanh cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((khi sach) OR (khoa sach)) - hanh ((tranh cua) or (manh cua)) dong cong dan than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((khi sach) OR (khoa sach)) - hanh ((tranh cua) OR (manh cua)) dong cong dan than cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((khi sach) OR (khoa sach)) - hanh ((tranh cua) or (manh cua)) dong cong dan than cap".
• Adding a wildcard symbol may retrieve word variants: doi ((khi sach) OR (khoa sach)) - hanh ((tranh cua) or (manh cua)) dong cong dan than cap*.