Perhaps you should try some spelling variations:
dang xay » dang van, van xay
lang van » dang van, tang van, hoang van
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham duc » pham duc, cham soc, pham duy
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha
han tri » han tai, van tri, thanh tri
va han » va phan, van han, va hanh
thiet » thieu

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 ky ((((lang xa) OR (lang van))) or (dang xay)) hoi. hieu van cham duc va han tri va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((((lang xa) OR (lang van))) OR (dang xay)) hoi. hieu van cham duc va han tri va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((((lang xa) OR (lang van))) or (dang xay)) hoi. hieu van cham duc va han tri va thiet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((((lang xa) OR (lang van))) or (dang xay)) hoi. hieu van cham duc va han tri va thiet*.