Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
van hanh » van thanh, ban hanh, van anh
thu sach » thuat sach, thuoc sach, thu hoach
lang mai » lang dai, lang hai, lang man
cham luc » cham soc, nhan luc, cham cuu
hieu va » lieu va, hieu qua
luc van » luoc van, luu van, duc van
tu sach » su sach, te sach, tu cach
hieu ve » hieu van
mai hoi » mai khoi, dai hoi, lai hoi
y lang » o lang, _ lang, tay 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)) y lang mai hoi. ((hieu ve) or (hieu va)) cham luc van hanh vi cua thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y lang mai hoi. ((hieu ve) OR (hieu va)) cham luc van hanh vi cua thuoc.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y lang mai hoi. ((hieu ve) or (hieu va)) cham luc van hanh vi cua thuoc*.