Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
hieu van » thien van, lieu va
cham duc » pham duc, cham soc, pham duy
va doanh » van doanh, vay doanh, va danh
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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 y nang xa hoi. ((((hieu ve) OR (hieu va))) or (hieu van)) cham duc va doanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. ((((hieu ve) OR (hieu va))) OR (hieu van)) cham duc va doanh van cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. ((((hieu ve) OR (hieu va))) or (hieu van)) cham duc va doanh van cua tre*".