Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
mang xa » lang xa, dang xay, mang cua
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
thuc va » thuc vat, thuc dan, thuc day
vi cua » vai cua, di cua
va cam » va cham, va cac, va cao
tuc va » truc va, tuc xa, duc va
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((mang xa) OR (mang may)) hoi. hieu va cam ((tuc va) OR (thuc va)) hanh vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((mang xa) or (mang may)) hoi. hieu va cam ((tuc va) OR (thuc va)) hanh vi cua te~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((mang xa) or (mang may)) hoi. hieu va cam ((tuc va) OR (thuc va)) hanh vi cua te*.