Perhaps you should try some spelling variations:
thien van » thi van
va triet » va thiet, va trien, ve triet
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
cac xuc » cam xuc, chat xuc, cac cuoc
tai va » thai va, mai va, tri va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang xa hoi. ((hieu ve) or (thien van)) ((cac xuc) or (cac nuoc)) van hanh tai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. ((hieu ve) OR (thien van)) ((cac xuc) OR (cac nuoc)) van hanh tai va triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. ((hieu ve) or (thien van)) ((cac xuc) or (cac nuoc)) van hanh tai va triet*.