Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu thanh » thu thang, tu thanh, thuan thanh
hanh hai » thanh hai, nhanh hai, hang hai
thu hanh » thuc hanh, thuy hanh, thi hanh
tu sach » thu sach, su sach, te sach
su tien » su kien, su hien, tu tieng
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
ve am » va am

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 ((thu hanh) OR (thu thanh)) xa hoi. hieu ve am thuc va hanh hai ((cua triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((thu hanh) OR (thu thanh)) xa hoi. hieu ve am thuc va hanh hai ((cua triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((thu hanh) OR (thu thanh)) xa hoi. hieu ve am thuc va hanh hai ((cua triet) or (su tien))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((thu hanh) OR (thu thanh)) xa hoi. hieu ve am thuc va hanh hai ((cua triet) or (su tien))*.