Perhaps you should try some spelling variations:
tai lang » tai cong, thi lan, va lang
cam thuc » am thuc, nam thuc, cam thu
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
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((tai lang) OR (tai san)) xa hoi. hieu ve cam thuc va hanh lai ((su triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((tai lang) OR (tai san)) xa hoi. hieu ve cam thuc va 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 cam thuc va 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 cam thuc va hanh lai ((su triet) or (cua viet))*.