Perhaps you should try some spelling variations:
sach trien » sach tien, sach tren, sach thieu
trien quan » trien quang, thien quan, truyen quan
doanh bat » danh bat, doanh tai, doanh va
hieu van » thien van, lieu va
va doanh » van doanh, vay doanh, va danh
cham duc » pham duc, cham soc, pham duy
tu sach » thu sach, su sach, te sach
bat cuu » bat cu, bat cua
hieu va » lieu va, hieu qua
quan xa » quan ha, quan va, quan cua
cuu tre » cua tre, cau tren, cau treo

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 trien quan xa hoi. ((((hieu ve) OR (hieu va))) or (hieu van)) cham duc va doanh bat cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach trien quan xa hoi. ((((hieu ve) OR (hieu va))) OR (hieu van)) cham duc va doanh bat cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach trien quan xa hoi. ((((hieu ve) OR (hieu va))) or (hieu van)) cham duc va doanh bat cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach trien quan xa hoi. ((((hieu ve) OR (hieu va))) or (hieu van)) cham duc va doanh bat cuu tre*.