Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thu sach » tu sach, thuoc sach, thu hoach
tay dung » xay dung, tac dung, tay nung
minh hai » minh khai, tinh hai, manh hai
tay lang » tai lang, tay tang, tay quang
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va, hieu van
va minh » van minh, vua minh, va kinh
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
ve nam » he nam, va nam, le nam
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) OR (thuat sach)) ((tay lang) or (tay dung)) xay hoi. hieu ve nam tu va minh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) ((tay lang) OR (tay dung)) xay hoi. hieu ve nam tu va minh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuat sach)) ((tay lang) or (tay dung)) xay hoi. hieu ve nam tu va minh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuat sach)) ((tay lang) or (tay dung)) xay hoi. hieu ve nam tu va minh hai cua tre*.