Perhaps you should try some spelling variations:
sach ty » sach tu, sach thu, xach tay
hanh de » hanh ve, hanh kem
xanh di » danh di, vanh dai, xanh tai
thu vat » thuc vat, thu va, thuat vat
cac thu » cach thuc, cac thoi
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

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: toc ((sach ty) OR (sach y)) nang xa hoi. hieu va cac thu vat ((xanh di) OR (hanh de)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ty) OR (sach y)) nang xa hoi. hieu va cac thu vat ((xanh di) or (hanh de)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ty) OR (sach y)) nang xa hoi. hieu va cac thu vat ((xanh di) or (hanh de)) cua tre*.