Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
van hau » van ha, van hai, van dau
van cau » van dau, van chat, toan cau
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
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: so sach y ((nang xa) or (nang ma)) hoi. hieu ((van cau) or (van hau)) thuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((nang xa) OR (nang ma)) hoi. hieu ((van cau) OR (van hau)) thuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach y ((nang xa) or (nang ma)) hoi. hieu ((van cau) or (van hau)) thuc va hanh vi cua tre*.