Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
tai lang » tai cong, thi lan, tai san
su triet » su viet, su tien, ve triet
cam thuc » am thuc, nam thuc, cam thu
sach tai » sach bai, sach tham, sach dao
va danh » va dinh, va dan, dia danh
su sach » so sach, vu sach
va hanh » van hanh, va thanh, ban hanh
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
va cam » va cham, va cac, va cao

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