Perhaps you should try some spelling variations:
dinh chi » dinh thi, dinh tri, dinh moi
tu sach » thu sach, su sach, te sach
sinh va » sinh vat, tinh va, dinh van
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
va dinh » van dinh, va kinh, vu dinh
sach ky » sac ky, sach y, sach ty
va tinh » may tinh
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu ve cac duc ((va dinh) OR (va tinh)) ((dinh chi) or (sinh va)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu ve cac duc ((va dinh) OR (va tinh)) ((dinh chi) OR (sinh va)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu ve cac duc ((va dinh) OR (va tinh)) ((dinh chi) or (sinh va)) tre*".