Perhaps you should try some spelling variations:
sach hoa » sach ha, sach hoi, bach hoa
van hanh » van thanh, ban hanh, van anh
cham tuc » nham thuc, pham thuc, tham thuc
su sach » so sach, vu sach
hai cua » thai cua, dai cua, hoi cua
va hanh » va thanh, va danh, ban hanh
hieu va » lieu va, hieu qua
hieu ve » hieu van
cua tre » cua te, cuu tre, cua triet
dan xa » dan xac, dan xay, dan ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach hoa dan xa hoi. ((hieu ve) or (hieu va)) cham tuc ((va hanh) OR (van hanh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach hoa dan xa hoi. ((hieu ve) OR (hieu va)) cham tuc ((va hanh) OR (van hanh)) hai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach hoa dan xa hoi. ((hieu ve) or (hieu va)) cham tuc ((va hanh) OR (van hanh)) hai cua tre*".