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

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 hoi. ((hieu quan) OR (hieu qua)) tham hoc va hanh vi luu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky lang xa hoi. ((hieu quan) OR (hieu qua)) tham hoc va hanh vi luu tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky lang xa hoi. ((hieu quan) OR (hieu qua)) tham hoc va hanh vi luu tre*.