Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
tu sach » thu sach, su sach, te sach
tang ma » mang may, tang van
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
ky tang » ky nang, ky dang, kho tang
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac
cua te » cua tu
du va » dau va, tu va, su va

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