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

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

• Performing a fuzzy search may retrieve terms with similar spellings: su 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: su 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: su sach y tang ma hoi. hieu ((ve cam) or (va cam)) thuc va hanh vi cua tre*.