Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
cau tren » cu tren, dau tren, ca tren
dang mau » dong mau, dang van, dang su
lap cau » luat cau, phap cau
ve chat » va chat, van chat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
dang ma » dang mam, dang mat, tang ma
hieu ve » hieu va, hieu van
doc va » duoc va, hoc va, loc va

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 ky ((dang ma) OR (dang mau)) hoi. hieu ve chat ((doc va) OR (duc va)) thanh lap cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((dang ma) OR (dang mau)) hoi. hieu ve chat ((doc va) or (duc va)) thanh lap cau tren~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((dang ma) OR (dang mau)) hoi. hieu ve chat ((doc va) or (duc va)) thanh lap cau tren*.