Perhaps you should try some spelling variations:
danh ban » doanh ban, danh bat, danh bac
quan tre » quan tren, quang tri, quang tru
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
cao duc » dao duc, giao duc, tao duoc
cao suc » cao su
va danh » va dinh, va dan, va hanh
y lang » o lang, _ lang, tay lang

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 lang xa hoi. lieu va ((cao duc) or (cao suc)) va danh ban ((quan tre) OR (quan tri))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y lang xa hoi. lieu va ((cao duc) OR (cao suc)) va danh ban ((quan tre) OR (quan tri)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y lang xa hoi. lieu va ((cao duc) or (cao suc)) va danh ban ((quan tre) OR (quan tri))".
• Adding a wildcard symbol may retrieve word variants: tu sach y lang xa hoi. lieu va ((cao duc) or (cao suc)) va danh ban ((quan tre) OR (quan tri))*.