Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
doanh va » doan va, doanh tai, doanh cua
thu nang » thu hang, thu bang, tho nang
cham duc » pham duc, cham soc, pham duy
thi nang » thi cong, ki nang, thi hanh
tu sach » thu sach, te sach, tu cach
duc van » duc va, duc tan, duc manh
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
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) OR (su sach)) ((thu nang) or (thi nang)) xa hoi. hieu ve cham duc van doanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ((thu nang) OR (thi nang)) xa hoi. hieu ve cham duc van doanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ((thu nang) or (thi nang)) xa hoi. hieu ve cham duc van doanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ((thu nang) or (thi nang)) xa hoi. hieu ve cham duc van doanh va cua tre*.