Perhaps you should try some spelling variations:
cau treo » cau theo, cau triet, cau trieu
dang xay » dang van, van xay
cau tren » cu tren, dau tren, ca tren
van cham » van chat, van tham, va cham
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, lang van
te sach » toc sach
soc va » hoc va, loc va, doc va
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((lang xa) OR (dang xay)) hoi. hieu van cham soc va dan vi ((cau tren) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((lang xa) OR (dang xay)) hoi. hieu van cham soc va dan vi ((cau tren) OR (cau treo))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((lang xa) OR (dang xay)) hoi. hieu van cham soc va dan vi ((cau tren) or (cau treo))*".