Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
tay lang » tai lang, tay tang, tay quang
cac tac » cac toc, cac bac, cac dac
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac nuoc
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
va anh » van anh, va danh, va hanh
anh va » hanh va
va cua » va chua, via cua, ca cua

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 (ky dang)) xa hoi. hieu va ((cac tuc) OR (cac tac)) va anh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((tay lang) OR (ky dang)) xa hoi. hieu va ((cac tuc) OR (cac tac)) va anh va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((tay lang) or (ky dang)) xa hoi. hieu va ((cac tuc) OR (cac tac)) va anh va cua tre*".