Perhaps you should try some spelling variations:
nhien cac » hien cac, thien cac, vien cac
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hanh vai » hanh vi, hanh va, hanh tai
su triet » su viet, su tien, ve 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
va hanh » van hanh, va thanh, va danh
thiet » thieu

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. thien nhien cac nuoc va hanh vai ((su triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. thien nhien cac nuoc va hanh vai ((su triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. thien nhien cac nuoc va hanh vai ((su triet) or (va thiet))*.