Perhaps you should try some spelling variations:
doanh van » doan van, doanh ban, doanh nhan
chat luc » chat xuc, chat lua, nhan luc
doanh va » doan va, doanh tai, doanh cua
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
ve chat » va chat, van chat
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc 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)) ky nang ma hoa. hieu ve chat luc va ((doanh van) OR (doanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang ma hoa. hieu ve chat luc va ((doanh van) OR (doanh va)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang ma hoa. hieu ve chat luc va ((doanh van) OR (doanh va)) cua tre*".