Perhaps you should try some spelling variations:
vay doanh » van doanh, ly doanh, voi doanh
sach kem » hanh kem
doanh va » doan va, doanh tai, doanh cua
luc vay » luc va, luc van, luoc van
vu cham » va cham, vu kham, tu cham
cua tre » cua te, cuu tre, cua triet
ve cham » va cham, ve chat, ve chim
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
va cua » va chua, via cua, ca cua

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 kem) or (sac ky)) nang xa hoi. hieu ((ve cham) OR (vu cham)) luc vay doanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach kem) OR (sac ky)) nang xa hoi. hieu ((ve cham) OR (vu cham)) luc vay doanh va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach kem) or (sac ky)) nang xa hoi. hieu ((ve cham) OR (vu cham)) luc vay doanh va cua tre*".