Perhaps you should try some spelling variations:
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu va, hieu van
tu sach » thu sach, te sach, tu cach
ky sang » ky nang, ky dang, ky tang
su sach » so sach, vu sach
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua

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) OR (su sach)) ky sang ma hoi. hieu ve cam ((xuc va) or (luc va)) hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky sang ma hoi. hieu ve cam ((xuc va) OR (luc va)) hanh vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky sang ma hoi. hieu ve cam ((xuc va) or (luc va)) hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky sang ma hoi. hieu ve cam ((xuc va) or (luc va)) hanh vi cua vat*.