Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
toc sach » hoc sach, doc sach, thuoc sach
thuoc va » thuc va, thuoc ma, thuong va
sach tu » sach thu, cach tu, sach ty
tu lang » cu lang, tu lanh, xu lang
lang xa » lang ha, dang xay, lang van
hieu va » hieu qua
cuu tre » cua tre, cau tren, cau treo
va dau » va dao
dau ve » dap ve
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: toc sach tu lang xa hoi. ((hieu va) or (lieu va)) nam thuoc va dau ve cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu lang xa hoi. ((hieu va) OR (lieu va)) nam thuoc va dau ve cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sach tu lang xa hoi. ((hieu va) or (lieu va)) nam thuoc va dau ve cuu tre*.