Perhaps you should try some spelling variations:
dang xay » dang van, van xay
hang doi » hang di, hang loi, huong doi
tu sach » thu sach, su sach, te sach
vu cham » va cham, vu kham, tu cham
doi cua » dai cua, hoi cua
va hang » van hang, va nang, va lang
thuc va » thuc vat, thuc dan, thuc day
ve cham » va cham, ve chat, ve chim
sach ky » sac ky, sach y, sach ty
lang ha » long ha
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: tu sach ky ((lang ha) or (dang xay)) hoi. hieu ((ve cham) or (vu cham)) thuc va hang doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((lang ha) OR (dang xay)) hoi. hieu ((ve cham) OR (vu cham)) thuc va hang doi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((lang ha) or (dang xay)) hoi. hieu ((ve cham) or (vu cham)) thuc va hang doi cua tre*.