Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, dang xay
hieu ve » hieu va, hieu van
ang xa » lang xa, mang xa, dang xay
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, duc 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: su sach ty ((xang xa) OR (ang xa)) hoi. hieu ve cam ((tuc va) or (tuc xa)) hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((xang xa) OR (ang xa)) hoi. hieu ve cam ((tuc va) OR (tuc xa)) hanh vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((xang xa) OR (ang xa)) hoi. hieu ve cam ((tuc va) or (tuc xa)) hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((xang xa) OR (ang xa)) hoi. hieu ve cam ((tuc va) or (tuc xa)) hanh vi cua vat*.