Perhaps you should try some spelling variations:
cao thuoc » cay thuoc, cua thuoc, nam thuoc
dang cay » dang xay, dang ca, dang cac
cay phoi » cap phoi, tay hoi, cay cho
hieu van » hieu va, thien van, lieu va
cam quoc » cac quoc, cao quoc, nam quoc
san benh » sau benh, tai benh, so benh
tu sach » thu sach, su sach, te sach
benh ve » benh va, benh vien, benh viem
cuu tre » cua tre, cau tren, cau treo
ve cuu » ve cau, ve chu, ve cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach _ dang cay phoi. hieu van ((cam quoc) or (cao thuoc)) san benh ve cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach _ dang cay phoi. hieu van ((cam quoc) OR (cao thuoc)) san benh ve cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach _ dang cay phoi. hieu van ((cam quoc) or (cao thuoc)) san benh ve cuu tre*.