Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
tham hoc » thai hoc, tham hoa, than hoc
te sach » toc sach
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 cac, te san
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) or (te sach)) ky lang xa hoi. ((hieu quan) or (hieu qua)) tham hoc va hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te sach)) 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) or (te sach)) ky lang xa hoi. ((hieu quan) or (hieu qua)) tham hoc va hanh vi luu tre*.