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