Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dinh lam » dinh van, tinh lao
lam cua » nam cua, lam chat
va dinh » van dinh, va kinh, va tinh
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
nang xa » nang x, lang xa, nang ma
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: ((te sach) or (toc sach)) ky ((nang xa) or (tang ma)) hoi. hieu va pham duc va dinh lam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky ((nang xa) OR (tang ma)) hoi. hieu va pham duc va dinh lam cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky ((nang xa) or (tang ma)) hoi. hieu va pham duc va dinh lam cua tre*.