Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
su tien » su kien, su hien, tu tieng
vu sach » vu bach, vu khach
ve nam » he nam, va nam, le nam
x hoi » xa hoi, x ho, 5 hoi
vi su » va su, ve su, ki su
o hoi » co hoi, o hoc, o hai

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) or (vu sach)) ky nang ((x hoi) or (o hoi)). hieu ve nam thuc va hanh vi su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang ((x hoi) OR (o hoi)). hieu ve nam thuc va hanh vi su tien.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky nang ((x hoi) or (o hoi)). hieu ve nam thuc va hanh vi su tien*.