Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
luc cham » luc tham, tuc cham, phuc cham
hang cao » hoang cao, nang cao, hang ca
hieu luc » hieu luat, hieu qua
sach ty » sach y, sach tu, sach thu
cuu tre » cua tre, cau tren, cau treo
cao hoi » cau hoi, co hoi, cao hoc
ty hang » ly hang, ty xang, thi hang
soc va » hoc va, doc va, goc va
loc va » hoc va, luc va
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: thuat sach ty hang cao hoi. hieu luc cham ((soc va) or (loc va)) hanh vi ((cua te) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ty hang cao hoi. hieu luc cham ((soc va) OR (loc va)) hanh vi ((cua te) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: thuat sach ty hang cao hoi. hieu luc cham ((soc va) or (loc va)) hanh vi ((cua te) or (cuu tre))*.