Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
thuc dia » thuc dieu, thuat dia, thuc giai
thanh vi » hanh vi, thanh va, thanh ve
thuc gia » thuc giai, thue gia, tuc gia
cua tre » cua te, cuu tre, cua triet
so sach » so sanh, bo sach, co sach
va cach » va cac
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang xa hoi. hieu va cach ((thuc gia) OR (thuc dia)) thanh vi ((cua tre) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang xa hoi. hieu va cach ((thuc gia) OR (thuc dia)) thanh vi ((cua tre) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang xa hoi. hieu va cach ((thuc gia) OR (thuc dia)) thanh vi ((cua tre) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: so sach y nang xa hoi. hieu va cach ((thuc gia) OR (thuc dia)) thanh vi ((cua tre) or (va triet))*.