Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
lam thuc » lam thuoc, am thuc, nam thuc
lang van » dang van, tang van, hoang van
tu cach » tu cac
cua tre » cuu tre, cua triet, dua tren
thuc ca » thuc cua, thuc can, thuc cao
hieu va » lieu va, hieu qua
van hoi » van hoa, van hoc, van hoe
ky lang » ky nang, ky dang, ky tang
va lam » van lam, va lap
ca dan » cac dan, ca dao
dan vi » doan vi, don vi, dan va
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (thu sach)) ky lang van hoi. hieu va lam thuc ca dan vi ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) ky lang van hoi. hieu va lam thuc ca dan vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (thu sach)) ky lang van hoi. hieu va lam thuc ca dan vi ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) ky lang van hoi. hieu va lam thuc ca dan vi ((cua tre) OR (cua te))*.