Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, va thuoc
ban hanh » ban hang
hanh tai » thanh tai, hang tai, han tai
cua nuoc » cua nguoi, nha nuoc, cap nuoc
te sach » toc sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
duc ban » duc tan, duc van, dua ban
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: te sach ty xang xa hoi. hieu ve cam duc ban hanh tai ((cua thuoc) or (((cua nuoc) OR (cua quoc))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty xang xa hoi. hieu ve cam duc ban hanh tai ((cua thuoc) OR (((cua nuoc) OR (cua quoc)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty xang xa hoi. hieu ve cam duc ban hanh tai ((cua thuoc) or (((cua nuoc) OR (cua quoc))))".
• Adding a wildcard symbol may retrieve word variants: te sach ty xang xa hoi. hieu ve cam duc ban hanh tai ((cua thuoc) or (((cua nuoc) OR (cua quoc))))*.