Perhaps you should try some spelling variations:
dang xay » dang van, van xay
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
tu sach » thu sach, su sach, te sach
dao bai » cao bai, dao hai, dap bai
dao lai » dao lam, dao hai, dao li
hieu va » lieu va, hieu qua
lang xa » lang ha, lang van
cua te » cua tu

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) or (dang xay)) hoi. hieu va cac nuoc va ((dao lai) OR (dao bai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((lang xa) OR (dang xay)) hoi. hieu va cac nuoc va ((dao lai) OR (dao bai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((lang xa) or (dang xay)) hoi. hieu va cac nuoc va ((dao lai) OR (dao bai)) cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((lang xa) or (dang xay)) hoi. hieu va cac nuoc va ((dao lai) OR (dao bai)) cua te*.