Perhaps you should try some spelling variations:
pham huu » pham duc, pham duy, phan huy
ban hanh » ban hang
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
va tinh » may tinh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet

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 ky nang ma hoa. hieu va pham huu ((va tinh) or (ban hanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ma hoa. hieu va pham huu ((va tinh) OR (ban hanh)) vai cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ma hoa. hieu va pham huu ((va tinh) or (ban hanh)) vai cua tre*.