Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
sang xa » song xa, lang xa, sang ma
van cam » van nam, van lam, van cau
cam luc » cam xuc, cau luc
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
y sang » _ sang, duy sang
luc va » duc va, tuc va, loc va

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 y sang xa hoi. hieu van cam luc va ((hanh tai) or (hanh vi)) ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y sang xa hoi. hieu van cam luc va ((hanh tai) OR (hanh vi)) ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y sang xa hoi. hieu van cam luc va ((hanh tai) or (hanh vi)) ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: thu sach y sang xa hoi. hieu van cam luc va ((hanh tai) or (hanh vi)) ((cuu tre) OR (cua tre))*.