Perhaps you should try some spelling variations:
thuoc phai » thuoc phap, thuc pham, thuoc tai
trinh va » trinh van, trinh vat, trinh ve
hoc phat » hoc phan, hoc pho
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
nang xa » lang xa, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
va lam » van lam, va lap
va cua » va chua, via cua, ca 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 ky ((nang xa) or (nang x)) hoi. hieu va lam ((thuoc phai) or (hoc phat)) trinh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang x)) hoi. hieu va lam ((thuoc phai) OR (hoc phat)) trinh va cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (nang x)) hoi. hieu va lam ((thuoc phai) or (hoc phat)) trinh va cua tre*.