Perhaps you should try some spelling variations:
thieu bien » thieu nien, tieu bieu, hien bien
bien chat » bien phap, ban chat, bien che
thanh tai » thanh hai, thanh toan, doanh tai
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
sach ky » sac ky, sach y, sach ty
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc 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. thieu bien chat ((xuc va) OR (luc va)) thanh tai ((su triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. thieu bien chat ((xuc va) OR (luc va)) thanh tai ((su triet) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. thieu bien chat ((xuc va) OR (luc va)) thanh tai ((su triet) or (va thiet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. thieu bien chat ((xuc va) OR (luc va)) thanh tai ((su triet) or (va thiet))*.