Perhaps you should try some spelling variations:
cay thuoc » cua thuoc, nam thuoc, va thuoc
doanh dan » doanh ban, doanh van, doanh dao
toc sach » hoc sach, doc sach, thuoc sach
hieu van » thien van, lieu va, hieu ve
thuoc va » thuc va, thuoc ma, thuong va
va doanh » van doanh, vay doanh, va danh
ky lang » ky dang, ky tang, tay lang
hieu va » lieu va, hieu qua
dan cua » dan ca, ban cua, dai cua
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 ((ky lang) OR (ky nang)) xa hoi. ((hieu van) or (hieu va)) cay thuoc va doanh dan cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky lang) OR (ky nang)) xa hoi. ((hieu van) OR (hieu va)) cay thuoc va doanh dan cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ky lang) OR (ky nang)) xa hoi. ((hieu van) or (hieu va)) cay thuoc va doanh dan cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky lang) OR (ky nang)) xa hoi. ((hieu van) or (hieu va)) cay thuoc va doanh dan cua te*.