Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hoang xa » hoang ha, hoang va, hoang xuan
thuc ban » thuoc ban, thuc dan, thu ban
ban hanh » ban hang
hang xa » hang va, hang ca, lang xa
hieu va » lieu va, hieu qua
co thuc » do thuc, co thua, mo thuc
cua tu » cua tuc, cua su, cua cu
va co » vo co

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y ((hang xa) or (hoang xa)) hoi. hieu va co thuc ban hanh vi ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y ((hang xa) OR (hoang xa)) hoi. hieu va co thuc ban hanh vi ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: toc sach y ((hang xa) or (hoang xa)) hoi. hieu va co thuc ban hanh vi ((cua te) or (cua tu))*.