Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
ly nang » ly hang, ly vang, ly quang
dau hoi » cau hoi, dai hoi, dan hoi
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
va danh » va dinh, va dan, va hanh
danh di » danh du, xanh di, danh dien
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 ((ly nang) or (ky nang)) dau hoi. hieu ve pham duc va danh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly nang) OR (ky nang)) dau hoi. hieu ve pham duc va danh di cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly nang) or (ky nang)) dau hoi. hieu ve pham duc va danh di cua tre*.