Perhaps you should try some spelling variations:
tang ma » mang may, tang van
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
sang ma » nang ma, sang tao, mang may
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 ky ((sang ma) OR (tang 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 ky ((sang ma) OR (tang 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 ky ((sang ma) OR (tang ma)) hoi. hieu ve cam ((xuc va) or (luc va)) hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((sang ma) OR (tang ma)) hoi. hieu ve cam ((xuc va) or (luc va)) hanh vi cua vat*.