Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van, van xay
hanh tai » thanh tai, hang tai, han tai
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
so sach » so sanh, bo sach, co sach
cuc tre » duc tre, cua tre, cuu tre
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, tuc xa
luc va » duc 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 (so sach)) ky dang xay hoi. hieu ve cam ((tuc va) or (luc va)) hanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (so sach)) ky dang xay hoi. hieu ve cam ((tuc va) OR (luc va)) hanh tai cuc tre.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (so sach)) ky dang xay hoi. hieu ve cam ((tuc va) or (luc va)) hanh tai cuc tre*.