Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
tham hoc » thai hoc, tham hoa, than hoc
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
luu tre » luu tru, cuu tre, luy tre
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 sach ky lang xa hoi. ((hieu van) or (hieu va)) tham hoc va hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang xa hoi. ((hieu van) OR (hieu va)) tham hoc va hanh vi luu tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. ((hieu van) or (hieu va)) tham hoc va hanh vi luu tre*.