Perhaps you should try some spelling variations:
dang xay » dang van, van xay
thu sac » thu sach, thu san, thu xac
lang xa » lang ha, lang van
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
cac tu » cac thu, cach tu, cac du
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ky ((dang xay) or (lang xa)) hoi. hieu ve cac tu va danh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky ((dang xay) OR (lang xa)) hoi. hieu ve cac tu va danh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sac ky ((dang xay) or (lang xa)) hoi. hieu ve cac tu va danh vi cua tre*.