Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van canh » van anh, van hanh, van manh
canh tac » canh tay, canh giac, cong tac
thu sach » tu sach, thuat sach, thuoc sach
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, dua tren
cac lo » cac lop, cac co, cac ho
cac bo » bac bo, cac co

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. hieu ve ((cac lo) OR (cac bo)) van canh tac ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu ve ((cac lo) OR (cac bo)) van canh tac ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. hieu ve ((cac lo) OR (cac bo)) van canh tac ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu ve ((cac lo) OR (cac bo)) van canh tac ((cua tre) or (cua triet))*.