Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cua triet » cua viet, su triet, va triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cac xuc » cam xuc, cac nuoc, chat xuc
van anh » tuan anh, van minh
cua tre » cua te, cuu tre, dua tren
nang o » nang co, nang ho, nang ro
ve cac » va cac, vien cac
o hai » co hai, so hai, o lai

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 ky nang o hai. hieu ve cac xuc ((van thanh) or (van anh)) tri ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang o hai. hieu ve cac xuc ((van thanh) OR (van anh)) tri ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang o hai. hieu ve cac xuc ((van thanh) or (van anh)) tri ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang o hai. hieu ve cac xuc ((van thanh) or (van anh)) tri ((cua tre) OR (cua triet))*.