Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va cham » va chat, va tham
tinh va » trinh van, trinh vat, tinh gia
chua te » cua te, chua tu, chuan ted
chua xe » chua xi, chuan he, chuan ve

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 hoi. hieu va cham duc va ((tinh va) OR (tich va)) ((chua te) or (chua xe))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu va cham duc va ((tinh va) OR (tich va)) ((chua te) OR (chua xe)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu va cham duc va ((tinh va) OR (tich va)) ((chua te) or (chua xe))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu va cham duc va ((tinh va) OR (tich va)) ((chua te) or (chua xe))*.