Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
sach va » sach xa, sach ha, sach dao
nang xa » nang x, lang xa, nang ma
tang ma » mang may, tang van
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de 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 va ((nang xa) or (tang ma)) hoi. hieu vu cham duc va hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach va ((nang xa) OR (tang ma)) hoi. hieu vu cham duc va hanh di cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach va ((nang xa) or (tang ma)) hoi. hieu vu cham duc va hanh di cua viet*.