Perhaps you should try some spelling variations:
dinh cuu » dinh chi
sinh cua » manh cua, sinh va
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
va dinh » van dinh, va kinh, va tinh

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