Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
te sach » toc sach
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va, hieu qua
hieu ve » hieu van
chu tre » cho tre, chu tri, cuu tre
nang xa » nang x, lang xa, nang ma
va anh » van anh, va danh, va hanh
anh va » hanh va
va chu » va che, va cau, va chi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thu sach)) ky nang xa hoi. ((hieu ve) or (hieu va)) cam duc va anh va chu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ky nang xa hoi. ((hieu ve) OR (hieu va)) cam duc va anh va chu tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) ky nang xa hoi. ((hieu ve) or (hieu va)) cam duc va anh va chu tre*.