Perhaps you should try some spelling variations:
bo sach » co sach, hoc sach
luc van » luoc van, luu van, duc van
vu cham » va cham, vu kham, tu cham
sach ty » sach y, sach tu, sach thu
hieu vu » hieu va, hieu ve, hieu su
long ha » dong ha, cong ha, dong hoa
nang xa » nang x, lang xa, nang ma
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: bo sach ty ((nang xa) or (long ha)) hoi. hieu vu cham ((duc va) or (luc van)) hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ty ((nang xa) OR (long ha)) hoi. hieu vu cham ((duc va) OR (luc van)) hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: bo sach ty ((nang xa) or (long ha)) hoi. hieu vu cham ((duc va) or (luc van)) hanh vi cuu tre*.