Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
van thanh » ban thanh, van tuan
thanh vi » hanh vi, thanh va, thanh ve
toc sach » hoc sach, doc sach, thuoc sach
tai khoa » da khoa, noi khoa
thu sach » tu sach, thuat sach, thuoc sach
dai moi » doi moi, dai hoi
hieu ve » hieu va, hieu van
cac vuc » cac nuoc, cac vung, cac cuoc
vuc van » duc van, luc van, thuc van
o lang » hoa lang, hoi lang
ve cac » va cac, vien cac
vi cua » vai cua, di cua

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) or (thu sach)) o lang ((dai moi) or (tai khoa)). hieu ve cac vuc van thanh vi cua thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thu sach)) o lang ((dai moi) OR (tai khoa)). hieu ve cac vuc van thanh vi cua thuoc.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thu sach)) o lang ((dai moi) or (tai khoa)). hieu ve cac vuc van thanh vi cua thuoc*.