Perhaps you should try some spelling variations:
doanh va » doan va, doanh tai, doanh cua
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ty nang » ky nang, ty xang, ty hang
va cua » va chua, via cua, ca cua
ve cam » ve cham, ve cac, va cam
x hoi » xa hoi, o hoi, x ho
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: ((tu sach) OR (thu sach)) ty nang x hoi. hieu ve cam ((lo va) or (ly va)) doanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty nang x hoi. hieu ve cam ((lo va) OR (ly va)) doanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ty nang x hoi. hieu ve cam ((lo va) or (ly va)) doanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ty nang x hoi. hieu ve cam ((lo va) or (ly va)) doanh va cua tre*.