Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
va trien » va truyen, va tuyen, va tieng
vu sach » vu bach, vu khach
su sach » so sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
ve nam » he nam, va nam, le nam
thiet » thieu

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: ((vu sach) OR (su sach)) ky nang xa hoi. hieu ve nam thuc va hanh vi ((va trien) OR (va thiet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (su sach)) ky nang xa hoi. hieu ve nam thuc va hanh vi ((va trien) or (va thiet))~".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (su sach)) ky nang xa hoi. hieu ve nam thuc va hanh vi ((va trien) or (va thiet))*.