Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
van cam » van nam, van lam, van dam
van cau » van dau, van hau, van chat
sach ky » sac ky, sach y, sach ty
dan tai » van tai, dan thi, han tai
cuu tre » cua tre, cau treo
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky dang xa hoi. hieu ((van cam) OR (van cau)) xuc va dan tai ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang xa hoi. hieu ((van cam) OR (van cau)) xuc va dan tai ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky dang xa hoi. hieu ((van cam) OR (van cau)) xuc va dan tai ((cuu tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang xa hoi. hieu ((van cam) OR (van cau)) xuc va dan tai ((cuu tre) or (cau tren))*.