Perhaps you should try some spelling variations:
thi hang » thi hanh, thi nang, thi hong
van pham » san pham, van phan, van phat
tu sach » thu sach, su sach, te sach
ty hang » ly hang, ty xang, thu hang
va pham » va phat, va phap, va 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
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 ((ty hang) OR (thi hang)) x hoi. hieu ((va pham) or (van pham)) duc va danh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty hang) OR (thi hang)) x hoi. hieu ((va pham) OR (van pham)) duc va danh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty hang) OR (thi hang)) x hoi. hieu ((va pham) or (van pham)) duc va danh di cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty hang) OR (thi hang)) x hoi. hieu ((va pham) or (van pham)) duc va danh di cua tre*.