Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
mai khoi » mai khoa, tai khoa, cac khoi
sach vu » sach va, sach tu, sach xu
xuc van » duc van, luc van, vuc van
hieu va » lieu va, hieu qua
mai hoi » dai hoi, lai hoi, mai doi
sach uu » sach luu, sach tu, sach xu
va cam » va cham, va cac, va cao
vi su » va su, ve su, ki su

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 vu) OR (sach uu)) nang ((mai hoi) or (mai khoi)). hieu va cam xuc van hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach vu) OR (sach uu)) nang ((mai hoi) OR (mai khoi)). hieu va cam xuc van hanh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach vu) OR (sach uu)) nang ((mai hoi) or (mai khoi)). hieu va cam xuc van hanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach vu) OR (sach uu)) nang ((mai hoi) or (mai khoi)). hieu va cam xuc van hanh vi su triet*.