Perhaps you should try some spelling variations:
dao khang » dao khong, tao khang, tao khoang
thanh tai » thanh hai, thanh toan, doanh tai
sach dao » lanh dao
khang xa » khang a, hang ca, lang xa
luoc van » luoc can, luoc va, luot van
tu sach » thu sach, su sach, te sach
qua cac » cua cac
luc van » luu van, luc va, vuc van
duc van » duc va, duc tan, duc manh
tai cua » thai cua, tai cuc, tri cua
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 dao khang xa hoi. hieu qua cac ((((luc van) OR (duc van))) or (luoc van)) thanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach dao khang xa hoi. hieu qua cac ((((luc van) OR (duc van))) OR (luoc van)) thanh tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach dao khang xa hoi. hieu qua cac ((((luc van) OR (duc van))) or (luoc van)) thanh tai cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach dao khang xa hoi. hieu qua cac ((((luc van) OR (duc van))) or (luoc van)) thanh tai cua te*.