Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
van hanh » van thanh, ban hanh, van anh
duc phan » dung phan, duc thang, duc phung
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty hang » ly hang, ty xang, thi hang
hang ma » hang va, hang ca, tang ma
ma hoi » mai hoi, xa hoi, ma hoa
van ha » van hoa, van chat, van phan
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: te sach ty hang ma hoi. hieu ((van ha) OR (van hanh)) ((duc phan) or (duc va)) hanh vi cua thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty hang ma hoi. hieu ((van ha) OR (van hanh)) ((duc phan) OR (duc va)) hanh vi cua thuoc*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty hang ma hoi. hieu ((van ha) OR (van hanh)) ((duc phan) or (duc va)) hanh vi cua thuoc*".