Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
toc sach » hoc sach, doc sach, thuoc sach
quan nam » quang nam, xuan nam, quan am
nam thuc » nam thuoc, am thuc, nam thu
sach ty » sach y, sach tu, sach thu
ty lang » tay lang, ty xang, ty hang
lang xa » lang ha, dang xay, lang van
thuc va » thuc vat, thuc dan, thuc day
danh di » danh du, xanh di, danh dien
hanh de » hanh ve, hanh kem
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 ty lang xa hoi. hieu quan nam thuc va ((danh di) or (hanh de)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty lang xa hoi. hieu quan nam thuc va ((danh di) OR (hanh de)) cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ty lang xa hoi. hieu quan nam thuc va ((danh di) or (hanh de)) cua tre*.