Perhaps you should try some spelling variations:
lam thuc » lam thuoc, am thuc, nam thuc
dua tren » dung tren
tu sach » thu sach, su sach, te sach
cua tre » cuu tre, cua triet, cua thep
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
va lam » van lam, va lap
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 sach ky dang xa hoi. hieu va lam thuc va hanh vi ((((cua tre) or (dua tren))) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xa hoi. hieu va lam thuc va hanh vi ((((cua tre) OR (dua tren))) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xa hoi. hieu va lam thuc va hanh vi ((((cua tre) or (dua tren))) or (cua te))*.