Perhaps you should try some spelling variations:
dinh cuu » dinh chi
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
sinh va » sinh vat, tinh va, dinh van
va dinh » van dinh, va kinh, va tinh
cac dac » cac dan, cac dai, cac bac
cac duc » cac du, cao duc, cac nuoc
hieu ve » hieu va, hieu van
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) OR (cac dac)) va dinh ((dinh cuu) 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) OR (cac dac)) va dinh ((dinh cuu) 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) OR (cac dac)) va dinh ((dinh cuu) or (sinh va)) tre*".