Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
van thanh » ban thanh
thu sach » thuat sach, thuoc sach, thu hoach
van tuan » van quan, van ban, anh tuan
lang mai » lang dai, lang hai, lang man
cac xuc » cam xuc, cac nuoc, chat xuc
tu sach » su sach, te sach, tu cach
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
o lang » hoa lang, hoi lang
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: ((tu sach) or (thu sach)) o lang mai hoi. hieu ve cac xuc ((van thanh) OR (van tuan)) vi cua thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) o lang mai hoi. hieu ve cac xuc ((van thanh) OR (van tuan)) vi cua thuoc*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) o lang mai hoi. hieu ve cac xuc ((van thanh) OR (van tuan)) vi cua thuoc*".