Perhaps you should try some spelling variations:
thieu bien » thieu nien, hien bien, hieu hien
va thanh » gia thanh, ban thanh, va tinh
thanh va » thanh van, hanh va, thanh ha
de triet » ve triet, de thiet, su triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cac xuc » cac nuoc, chat xuc, cac cuoc
va de » va do, va le

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. ((thieu bien) or (tieu bieu)) ((cac xuc) OR (cam xuc)) va thanh va de triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. ((thieu bien) OR (tieu bieu)) ((cac xuc) OR (cam xuc)) va thanh va de triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. ((thieu bien) or (tieu bieu)) ((cac xuc) OR (cam xuc)) va thanh va de triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. ((thieu bien) or (tieu bieu)) ((cac xuc) OR (cam xuc)) va thanh va de triet*.