Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
vat xanh » vat thanh, sat anh, dat anh
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
van bac » van ban, van bao, dan bac
van hac » van hoc, van ha, van hai
xanh di » danh di, vanh dai, xanh tai
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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 ky ((nang xa) or (lang xa)) hoi. hieu ((van bac) or (van hac)) thuc vat xanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang xa) OR (lang xa)) hoi. hieu ((van bac) OR (van hac)) thuc vat xanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) or (lang xa)) hoi. hieu ((van bac) or (van hac)) thuc vat xanh di cua tre*.