Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
dinh cuu » dinh chi
sinh cua » manh cua, sinh va
tu sach » su sach, te sach, tu cach
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
va dinh » van dinh, va kinh, va tinh
ve cac » va cac, vien cac

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) OR (thu sach)) ky nang x ho. hieu ve 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) OR (thu sach)) ky nang x ho. hieu ve 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) OR (thu sach)) ky nang x ho. hieu ve cac duc va dinh ((dinh cuu) or (sinh cua)) tre*".