Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
cham tuc » nham thuc, pham thuc, tham thuc
hieu van » hieu va, thien van, lieu va
dang xay » dang van, van xay
hieu ve » hieu va
xay hoi » xa hoi, tay hoi, cay phoi
tuc van » thuc van, truc van, tuc va
cua cau » cua cac, cua chu, cua cay
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach _ dang xay hoi. ((hieu ve) OR (hieu van)) cham tuc van hanh vi ((cua te) or (cua cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach _ dang xay hoi. ((hieu ve) OR (hieu van)) cham tuc van hanh vi ((cua te) OR (cua cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach _ dang xay hoi. ((hieu ve) OR (hieu van)) cham tuc van hanh vi ((cua te) or (cua cau))".
• Adding a wildcard symbol may retrieve word variants: toc sach _ dang xay hoi. ((hieu ve) OR (hieu van)) cham tuc van hanh vi ((cua te) or (cua cau))*.