Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
cua tre » cuu tre, cua triet, dua tren
ve cham » va cham, ve chat, vu cham
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
cua te » cua tu
va cao » va cac, va co, va dao
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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