Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, dua tren
te sach » toc sach
van cac » van hac, van cau, van bac
nang co » nang cao, nang doc, nang noi
ty nang » ky nang, ty xang, ty hang
cac bo » bac bo, cac co
co hai » co dai, co hoi, o hai
bo van » vo van, so van, do van

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 ty nang co hai. hieu van cac bo van hanh vi ((cua tre) or (((cua triet) or (su triet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang co hai. hieu van cac bo van hanh vi ((cua tre) OR (((cua triet) OR (su triet)))).
• Adding a wildcard symbol may retrieve word variants: te sach ty nang co hai. hieu van cac bo van hanh vi ((cua tre) or (((cua triet) or (su triet))))*.