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
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, dua tren
hanh de » hanh ve, hanh kem
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hau luc » hau loc, nhan luc, hieu luc
nang xa » nang x, lang xa, nang ma

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