Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
va dinh » van dinh, va kinh, vu dinh
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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 ty nang cau hoi. hieu ve pham duc ((va dinh) OR (va tinh)) di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang cau hoi. hieu ve pham duc ((va dinh) OR (va tinh)) di cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang cau hoi. hieu ve pham duc ((va dinh) OR (va tinh)) di cua tre*.