Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nam thuoc » nam thuc, nam thu, nha thuoc
dau tieng » dau tien, cau tieng, day tieng
thuoc va » thuc va, thuoc ma, thuong va
tu sach » thu sach, su sach, te sach
xang xa » lang xa, mang xa, ang xa
qua nam » quan nam, cua nam, quang nam
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
vi dau » vi dai, va dau, bi dau

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 (thuoc sach)) ty xang xa hoi. hieu qua nam thuoc va danh vi dau tieng~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ty xang xa hoi. hieu qua nam thuoc va danh vi dau tieng.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ty xang xa hoi. hieu qua nam thuoc va danh vi dau tieng*.