Perhaps you should try some spelling variations:
sach van » sach han, sach va, bach van
van sang » van nang, van sung, van hang
su triet » su viet, ve triet
vu sach » vu bach, su sach, vu khach
luc van » luoc van, luu van, duc van
xuc van » duc van, xuc ban, thuc van
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, sang tao
su tien » su kien, su hien, tu tieng
ve cam » ve cham, ve cac, va cam
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach van sang ma hoi. hieu ve cam ((xuc van) or (luc van)) hanh vi ((su triet) OR (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach van sang ma hoi. hieu ve cam ((xuc van) OR (luc van)) hanh vi ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach van sang ma hoi. hieu ve cam ((xuc van) or (luc van)) hanh vi ((su triet) OR (su tien))".
• Adding a wildcard symbol may retrieve word variants: vu sach van sang ma hoi. hieu ve cam ((xuc van) or (luc van)) hanh vi ((su triet) OR (su tien))*.