Perhaps you should try some spelling variations:
nha thuoc » nha nuoc, nhan thuc, nha hoc
cua thuoc » cay thuoc, cua nuoc, cua quoc
thu sach » thuat sach, thuoc sach, thu hoach
lang dai » lang hai, lang mai, lang chai
van hanh » van thanh, ban hanh, van anh
xuc van » duc van, luc van, vuc van
tu sach » su sach, te sach, tu cach
dai hoi » dai hoc, dai hai, dai moi
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
y lang » o lang, _ lang, tay lang

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 dai hoi. hieu va cam xuc van hanh vi ((cua thuoc) or (nha thuoc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y lang dai hoi. hieu va cam xuc van hanh vi ((cua thuoc) OR (nha thuoc)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y lang dai hoi. hieu va cam xuc van hanh vi ((cua thuoc) or (nha thuoc))*.