Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, tu cach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
tang ma » mang may, tang van
te sach » toc sach
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
y tang » ky tang, 6 tang, 7 tang
vi cua » vai cua, di cua
ve cam » ve cham, ve cac, ve cai

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) or (te sach)) y tang ma hoi. hieu ((ve cam) or (va cam)) thuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y tang ma hoi. hieu ((ve cam) OR (va cam)) thuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) y tang ma hoi. hieu ((ve cam) or (va cam)) thuc va hanh vi cua tre*.