Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
chua te » cua te, chua tu, chuan ted
tinh va » tich va, trinh van, trinh vat
va tinh » may tinh
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
nang xa » lang xa, nang ma, mang xa
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: su sach ty ((nang xa) or (nang x)) hoi. hieu vu cham duc va tinh va ((chua te) OR (chua xe))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (nang x)) hoi. hieu vu cham duc va tinh va ((chua te) OR (chua xe)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang xa) or (nang x)) hoi. hieu vu cham duc va tinh va ((chua te) OR (chua xe))".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) or (nang x)) hoi. hieu vu cham duc va tinh va ((chua te) OR (chua xe))*.