Perhaps you should try some spelling variations:
dum tren » dua tren, duc tren, dung tren
thu sach » tu sach, thuat sach, thuoc sach
chat xuc » chat huu, cam xuc, chao xu
lang van » dang van, tang van, hoang van
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
tu cach » tu cac
van hoi » van hoa, van hoc, van hoe
ky lang » ky nang, ky dang, ky tang
hieu ve » hieu va
xuc va » duc va, tuc va, luc va
vi dum » vi du

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

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