Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ban benh » san benh, ba benh, ban banh
cam quoc » cac quoc, cao quoc, nam quoc
quoc ban » quoc bao, quoc lan, quoc quan
hoa hoi » khoa hoi, hoa hoc, hoc hoi
cua tre » cuu tre, cua triet, dua tren
hoa doi » hoa dai, hoc doi, xoa doi
hieu va » lieu va, hieu qua
benh li » benh ly, benh lo, benh vi
va cam » va cham, va cac, va cao
y lang » o lang, _ lang, tay lang
cua te » cua tu

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 lang ((hoa hoi) OR (hoa doi)). hieu va cam quoc ban benh li ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y lang ((hoa hoi) OR (hoa doi)). hieu va cam quoc ban benh li ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y lang ((hoa hoi) OR (hoa doi)). hieu va cam quoc ban benh li ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: toc sach y lang ((hoa hoi) OR (hoa doi)). hieu va cam quoc ban benh li ((cua tre) or (cua te))*.