Perhaps you should try some spelling variations:
doanh dan » doanh ban, doanh van, doanh dao
cham duc » pham duc, cham soc, phan duc
va doanh » van doanh, vay doanh, va danh
pham duy » pham duc
hieu van » hieu va, thien van, lieu va
dan cua » dan ca, ban cua, dai cua
tu sach » thu sach, su sach, te sach
hieu ve » hieu va
nang xa » nang x, lang xa, nang ma
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 van)) ((cham duc) OR (pham duy)) va doanh dan 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 van)) ((cham duc) OR (pham duy)) va doanh dan 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 van)) ((cham duc) OR (pham duy)) va doanh dan cua tre*".