Perhaps you should try some spelling variations:
ve triet » va trien, su triet
nam thuc » nam thuoc, am thuc, nam thu
nang tai » hang tai, tang tai, sang tai
su viet » so viet
su tien » su kien, su hien, tu tieng
thuc va » thuc vat, thuc dan, thuc day
so sach » so sanh, bo sach, co sach
tai hoi » tai khoi, dai hoi, tai hai
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
ve nam » he nam, va nam, le nam
y nang » ky nang, ly nang, v nang

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: so sach y nang tai hoi. hieu ve nam thuc va hanh vi ((((su tien) OR (su viet))) OR (ve triet))~.
• Adding a wildcard symbol may retrieve word variants: so sach y nang tai hoi. hieu ve nam thuc va hanh vi ((((su tien) or (su viet))) or (ve triet))*.