Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cua triet, dua tren
dao dai » dat dai, dao dan, tao dai
thuc va » thuc vat, thuc dan, thuc day
cuu tre » cau tren, cau treo
va chat » van chat, va phat, cao chat
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
va dao » ca dao

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang xa hoi. hieu ((va chat) OR (vo co)) thuc va dao dai ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang xa hoi. hieu ((va chat) or (vo co)) thuc va dao dai ((cua tre) OR (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang xa hoi. hieu ((va chat) or (vo co)) thuc va dao dai ((cua tre) OR (cuu tre))*.