Perhaps you should try some spelling variations:
doanh ca » doanh cua, doanh cao, doanh va
thi hang » thi hanh, thi nang, thi hong
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ty nang » ky nang, ty xang, ty hang
ca cua » co cua
ve cac » va cac, vien cac
lo va » lo van, lao va, le va

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 ((ty nang) or (thi hang)) xa hoi. hieu ve cac ((lo va) or (ly va)) doanh ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty nang) OR (thi hang)) xa hoi. hieu ve cac ((lo va) OR (ly va)) doanh ca cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((ty nang) or (thi hang)) xa hoi. hieu ve cac ((lo va) or (ly va)) doanh ca cua tre*.