Perhaps you should try some spelling variations:
thieu bien » thieu nien, tieu bieu, hien bien
bien cac » vien cac, dien cac, bien ca
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 » cam xuc, cac nuoc, chat xuc
va hang » van hang, va lang, va hanh
va nang » van nang, da nang, cam nang
su viet » so viet

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