Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
tay lang » tai lang, tay tang, tay quang
minh hai » minh khai, tinh hai, manh hai
tay dung » xay dung, tac dung, tay nung
hieu van » hieu va, thien van, lieu va
hai chu » hai chau, hoi chu, hai chi
va minh » van minh, vua minh, va kinh
chu tre » cho tre, chu tri, cuu tre
xay hoi » tay hoi, cay phoi, gay thoi
nam tu » nam thu, nam thuc

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((tay lang) or (tay dung)) ((xay hoi) OR (xa hoi)). hieu van nam tu va minh hai chu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((tay lang) OR (tay dung)) ((xay hoi) OR (xa hoi)). hieu van nam tu va minh hai chu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((tay lang) or (tay dung)) ((xay hoi) OR (xa hoi)). hieu van nam tu va minh hai chu tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((tay lang) or (tay dung)) ((xay hoi) OR (xa hoi)). hieu van nam tu va minh hai chu tre*.