Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cham duc » pham duc, cham soc, pham duy
cua viet » ca viet, hoa viet, cua vat
sach va » sach xa, sach ha, sach dao
va nang » van nang, da nang, cam nang
hieu va » lieu va, hieu qua
va cham » va chat, va tham
hang di » hang doi, hang vi, hang dien
x hoi » xa hoi, o hoi, x ho
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach va nang x hoi. hieu va cham duc va ((hanh vi) or (hang di)) ((cua viet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach va nang x hoi. hieu va cham duc va ((hanh vi) OR (hang di)) ((cua viet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: thuat sach va nang x hoi. hieu va cham duc va ((hanh vi) or (hang di)) ((cua viet) or (va thiet))*.