Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, phan duc
pham duy » pham duc
so sach » so sanh, bo sach, co sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
hieu vu » hieu va, hieu ve, hieu su
va tinh » may tinh
tinh va » tich va, trinh van, trinh vat
va chua » vua chua, ca chua, va chu
chua te » cua te, chua tu, chua xe

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 tu nang xa hoi. hieu vu ((cham duc) or (pham duy)) va tinh va chua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tu nang xa hoi. hieu vu ((cham duc) OR (pham duy)) va tinh va chua te.
• Adding a wildcard symbol may retrieve word variants: so sach tu nang xa hoi. hieu vu ((cham duc) or (pham duy)) va tinh va chua te*.