Perhaps you should try some spelling variations:
cao thuc » cao thuoc, can thuc, cao thu
hanh vai » hanh vi, hanh va, hanh tai
day hanh » day nhanh, day thanh, dao hanh
tru nang » tra nang, tri nang, truc nano
bao thuc » cao thuoc, am thuc, va thuc
te sach » toc sach
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
tu nang » tu nong, tu nano, tu lang

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 ((tu nang) OR (tru nang)) xa hoi. hieu va ((cao thuc) or (bao thuc)) day hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu nang) OR (tru nang)) xa hoi. hieu va ((cao thuc) OR (bao thuc)) day hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((tu nang) OR (tru nang)) xa hoi. hieu va ((cao thuc) or (bao thuc)) day hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((tu nang) OR (tru nang)) xa hoi. hieu va ((cao thuc) or (bao thuc)) day hanh vai cua tre*.