Perhaps you should try some spelling variations:
dang xay » dang van, van xay
su sach » so sach, vu sach
vu cham » va cham, vu kham, tu cham
cac van » cac dan
sac van » san van, sat van, tac van
hieu vu » hieu va, hieu ve, hieu su
sach ty » sach y, sach tu, sach thu
mang xa » lang xa, mang may, mang cua
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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 ((dang xay) or (mang xa)) hoi. hieu vu cham ((sac van) OR (cac van)) hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((dang xay) OR (mang xa)) hoi. hieu vu cham ((sac van) OR (cac van)) hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((dang xay) or (mang xa)) hoi. hieu vu cham ((sac van) OR (cac van)) hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((dang xay) or (mang xa)) hoi. hieu vu cham ((sac van) OR (cac van)) hanh vi cuu tre*.