Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
luc vay » luc va, luc van, luoc van
van cua » vang cua, ban cua, dan cua
luu van » cuu van, luan van, luu hanh
su sach » so sach, vu sach
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, v nang, may nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((y nang) OR (ly nang)) xa hoi. hieu ve cham ((luc vay) or (luu van)) doanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (ly nang)) xa hoi. hieu ve cham ((luc vay) OR (luu van)) doanh van cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) OR (ly nang)) xa hoi. hieu ve cham ((luc vay) or (luu van)) doanh van cua tre*".