Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van ban
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, dua tren
van anh » van thanh, tuan anh, van minh
te sach » toc sach
cau luc » cau truc, cau phuc
hieu ke » hieu kem, chieu ke, hieu ky
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
ke cau » ket cau

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 xa hoi. hieu ke cau luc ((van hanh) or (van anh)) de ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang xa hoi. hieu ke cau luc ((van hanh) OR (van anh)) de ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang xa hoi. hieu ke cau luc ((van hanh) or (van anh)) de ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang xa hoi. hieu ke cau luc ((van hanh) or (van anh)) de ((cua tre) OR (cua triet))*.