Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
thanh vi » hanh vi, thanh va, thanh ve
danh xay » dang xay, manh xay, anh xay
hieu vu » hieu va, hieu ve, hieu su
te sach » toc sach
xay hoi » xa hoi, tay hoi, cay phoi
ky danh » ky anh, ky dang
vu cham » va cham, vu kham, tu cham
soc va » hoc va, loc va, goc va
doc va » duoc va, hoc va, duc va
vi cau » va cau, ve cau, di cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (cuoc cach)) ky danh xay hoi. hieu vu cham ((soc va) OR (doc va)) thanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (cuoc cach)) ky danh xay hoi. hieu vu cham ((soc va) OR (doc va)) thanh vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (cuoc cach)) ky danh xay hoi. hieu vu cham ((soc va) OR (doc va)) thanh vi cau tren".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (cuoc cach)) ky danh xay hoi. hieu vu cham ((soc va) OR (doc va)) thanh vi cau tren*.