Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
tu sach » thu sach, su sach, te sach
cach le » cach de, cac le, cach ben
ve cach » va cach, ve cac, ve canh
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
le va » le van, te va, ly va

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

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