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