Perhaps you should try some spelling variations:
bieu hien » dieu hien, dieu khien, bien phien
sach thu » sach thue, sach thieu, sach tham
hien cac » thien cac, vien cac, hieu cac
va danh » va dinh, va hanh, dia danh
cac luc » cau luc, coc luc, cac nuoc
cua tre » cua te, cuu tre, cua triet
va dan » ca dan, va dao, va dau
co cua » con cua, ca cua, cong cua
x hoi » xa hoi, o hoi, x ho

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 thu) or (sach y)) nang x hoi. bieu hien cac luc ((va danh) OR (va dan)) co cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach y)) nang x hoi. bieu hien cac luc ((va danh) OR (va dan)) co cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thu) or (sach y)) nang x hoi. bieu hien cac luc ((va danh) OR (va dan)) co cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) or (sach y)) nang x hoi. bieu hien cac luc ((va danh) OR (va dan)) co cua tre*.