Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
tu sach » su sach, te sach, tu cach
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet
ma hoi » xa hoi, ma hoa, me hoi
qua am » quan am, qua ap, cua am
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: ((tu sach) or (thu sach)) ky nang ((ma hoi) or (mai hoi)). hieu qua am thuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang ((ma hoi) OR (mai hoi)). hieu qua am thuc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang ((ma hoi) or (mai hoi)). hieu qua am thuc van hanh vi cua tre*.