Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
nhan luc » nang luc
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
hanh de » hanh ve, hanh kem
cua tre » cua te, cuu tre, dua tren
sach ky » sac ky, sach y, sach ty
hau luc » hau loc, cau 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: toc sach ky nang xa hoi. hieu van ((hau luc) or (nhan luc)) van hanh de ((cua triet) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. hieu van ((hau luc) OR (nhan luc)) van hanh de ((cua triet) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. hieu van ((hau luc) or (nhan luc)) van hanh de ((cua triet) or (cua tre))*.