Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
van chao » van chat, van hao, van cho
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
va tinh » may tinh
cua tre » cua te, cuu tre, dua tren
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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 ma hoi. hieu van chao xu ((va tinh) or (van minh)) va ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ma hoi. hieu van chao xu ((va tinh) OR (van minh)) va ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ma hoi. hieu van chao xu ((va tinh) or (van minh)) va ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoi. hieu van chao xu ((va tinh) or (van minh)) va ((cua tre) OR (cua triet))*.