Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, van chat
cau bao » cau tao, ca bao, cu bao
bao van » dao van, cao van, hao van
cua tre » cua te, cuu tre, dua tren
nang o » nang co, nang ho, nang ro
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: te sach ky nang o hai. hieu van cau bao van hanh vi ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang o hai. hieu van cau bao van hanh vi ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang o hai. hieu van cau bao van hanh vi ((cua tre) OR (cua triet))*.