Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » thien van, lieu va, hieu ve
van hanh » van thanh, ban hanh, van anh
tu nong » tu dong, tu cong, tu tong
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, vuc van
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: thu sach ((tu nong) or (truc nano)) xa hoi. ((hieu van) OR (hieu va)) cam xuc van hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((tu nong) OR (truc nano)) xa hoi. ((hieu van) OR (hieu va)) cam xuc van hanh vi luu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((tu nong) or (truc nano)) xa hoi. ((hieu van) OR (hieu va)) cam xuc van hanh vi luu tre*".