Perhaps you should try some spelling variations:
tai lang » tai cong, thi lan, va lang
cac thuc » cach thuc, cac thu, can thuc
vat hanh » vat thanh, van hanh, va hanh
hanh lai » hanh lam, hanh tai, thanh lap
su triet » su viet, su tien, ve triet
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
tai san » tai ngan
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((tai lang) OR (tai san)) xa hoi. hieu ve cac thuc vat hanh lai ((su triet) OR (cua viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((tai lang) OR (tai san)) xa hoi. hieu ve cac thuc vat hanh lai ((su triet) or (cua viet))~".
• Adding a wildcard symbol may retrieve word variants: su sach ((tai lang) OR (tai san)) xa hoi. hieu ve cac thuc vat hanh lai ((su triet) or (cua viet))*.