Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
chat duc » chat xuc, chat doc, chet duoc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
ve chat » va chat, van chat
tu sach » thu sach, su sach, te sach
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
ma hoi » mai hoi, xa hoi, ma hoa
cua tu » cua tuc, cua su, cua cu

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