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
va chua » vua chua, ca chua, a chua
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
hieu vu » hieu va, hieu ve, hieu su
sach tu » sach thu, cach tu, sach ty
va tinh » may tinh
va chu » va che, va cau, va chi

You may be able to get more results by adjusting your search query.

• 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) OR (va chu)) te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach tu nang xa hoi. hieu vu ((cham duc) or (pham duy)) va tinh ((va chua) OR (va chu)) 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) OR (va chu)) te*.