Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
dang xay » dang van, van xay
tham soc » cham soc, tham nuoc, thai son
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
lang xa » lang ha, lang van
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cua tre » cua te, cuu tre, cua triet
te sach » toc sach
soc va » hoc va, loc va, doc 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 tham soc va danh vi ((cua tre) 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 tham soc va danh vi ((cua tre) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: te sach ky ((lang xa) or (dang xay)) hoi. hieu van tham soc va danh vi ((cua tre) or (cau treo))*.