Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
dang xay » dang van, van xay
tham doc » than doc, tham do, tham nuoc
va hanh » van hanh, va thanh, va danh
luu tre » luu tru, cuu tre, luy tre
lang xa » lang ha, lang van
sac ky » cac ky, sai ky
doc va » duoc va, hoc va, duc va
vi luu » vi lua
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky ((lang xa) or (dang xay)) hoi. ((hieu quan) or (hieu qua)) tham doc va hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((lang xa) OR (dang xay)) hoi. ((hieu quan) OR (hieu qua)) tham doc va hanh vi luu tre.
• Adding a wildcard symbol may retrieve word variants: te sac ky ((lang xa) or (dang xay)) hoi. ((hieu quan) or (hieu qua)) tham doc va hanh vi luu tre*.