Perhaps you should try some spelling variations:
van tham » van thanh, van chat, van tai
toc sach » hoc sach, doc sach, thuoc sach
van tuan » van quan, van ban, anh tuan
thuc dan » thuc hanh, hoc dan, thuc vat
dan dinh » dang dinh, doan dinh, van dinh
dinh dat » dinh ket, dinh van, dinh lam
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
dat cua » dai cua, day cua, mat cua
cua tre » cua te, cuu tre, cua triet

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 lang xa hoi. thi ((van tham) or (van tuan)) thuc dan dinh dat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky lang xa hoi. thi ((van tham) OR (van tuan)) thuc dan dinh dat cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang xa hoi. thi ((van tham) or (van tuan)) thuc dan dinh dat cua tre*.