Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua quoc
thu sach » thuat sach, thuoc sach, thu hoach
nang mai » nang ma, nang tai, lang mai
van hanh » van thanh, ban hanh, van anh
cua nuoc » cua quoc, cua nguoi, nha nuoc
tu sach » su sach, te sach, tu cach
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, vuc van
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam

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 nang mai hoi. hieu ve cam xuc van hanh vi ((cua thuoc) OR (cua nuoc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang mai hoi. hieu ve cam xuc van hanh vi ((cua thuoc) OR (cua nuoc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) y nang mai hoi. hieu ve cam xuc van hanh vi ((cua thuoc) OR (cua nuoc))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y nang mai hoi. hieu ve cam xuc van hanh vi ((cua thuoc) OR (cua nuoc))*.