Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thi hanh » thi thanh
danh hai » dang hai, lanh hai, manh hai
hieu cua » hieu qua, dieu cua, bieu cua
tu sach » thu sach, su sach, te sach
duc ban » duc tan, duc van, dua ban
hai cua » thai cua, dai cua, hoi cua
cua cao » cua cac, cu cao, cua cay
suc ban » suc ben, cuc ban, suc bat
hanh xa » hanh va, hanh ma, hanh xu
cua te » cua tu

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) thi hanh xa hoi. hieu cua cao ((suc ban) OR (duc ban)) danh hai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuoc sach)) thi hanh xa hoi. hieu cua cao ((suc ban) OR (duc ban)) danh hai cua te~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) thi hanh xa hoi. hieu cua cao ((suc ban) OR (duc ban)) danh hai cua te*.