Perhaps you should try some spelling variations:
cao thuc » cao thuoc, bao thuc, can thuc
thuc ban » thuoc ban, thuc dan, thu ban
ban hanh » ban hang
te sach » toc sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
cua tre » cuu tre, cua triet, dua tren
va cao » va cac, va co, va dao
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ly nang xa hoi. lieu va cao thuc ban hanh vi ((cua tre) or (((cua te) OR (cua tu))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly nang xa hoi. lieu va cao thuc ban hanh vi ((cua tre) OR (((cua te) OR (cua tu)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ly nang xa hoi. lieu va cao thuc ban hanh vi ((cua tre) or (((cua te) OR (cua tu))))".
• Adding a wildcard symbol may retrieve word variants: te sach ly nang xa hoi. lieu va cao thuc ban hanh vi ((cua tre) or (((cua te) OR (cua tu))))*.