Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
cuu tre » cua tre, cau tren, cau treo
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
xuc va » duc va, tuc va, luc va
vi cuu » vi luu, vinh cuu
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) or (thu sach)) ky lang xa hoi. ((hieu ve) OR (hieu van)) cam xuc va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (thu sach)) ky lang xa hoi. ((hieu ve) OR (hieu van)) cam xuc va hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) or (thu sach)) ky lang xa hoi. ((hieu ve) OR (hieu van)) cam xuc va hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (thu sach)) ky lang xa hoi. ((hieu ve) OR (hieu van)) cam xuc va hanh vi cuu tre*.