Perhaps you should try some spelling variations:
su triet » su tien, ve triet
su sach » so sach, vu sach
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
sach ky » sac ky, sach y, sach ty
su viet » so viet
hieu ve » hieu va, hieu van
tang ma » tang van
xuc va » duc va, tuc va, luc va
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 ky ((mang may) or (tang ma)) hoi. hieu ve cam xuc va danh vi ((su triet) OR (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((mang may) OR (tang ma)) hoi. hieu ve cam xuc va danh vi ((su triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((mang may) or (tang ma)) hoi. hieu ve cam xuc va danh vi ((su triet) OR (su viet))".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((mang may) or (tang ma)) hoi. hieu ve cam xuc va danh vi ((su triet) OR (su viet))*.