Perhaps you should try some spelling variations:
nien cac » dien cac, bien cac, hien cac
vien cac » vien bach, vien dai, vien da
vat dung » van dung, va dung, viet dung
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
xuc vat » thuc vat, xuat vat
y nang » ky nang, ly nang, v nang

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