Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
nien cac » dien cac, bien cac, hien cac
su triet » su viet, su tien, ve triet
hanh tai » thanh tai, hang tai, han tai
va hanh » van hanh, va thanh, va danh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
xuc va » duc va, tuc va, luc va

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

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