Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh tri » thanh tra, thanh tai, chinh tri
toc sach » hoc sach, doc sach, nuoc sach
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
luc va » tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (thuoc sach)) ky dang xa hoi. hieu ve cam ((duc va) or (luc va)) thanh tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuoc sach)) ky dang xa hoi. hieu ve cam ((duc va) OR (luc va)) thanh tri cua tre.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thuoc sach)) ky dang xa hoi. hieu ve cam ((duc va) or (luc va)) thanh tri cua tre*.