Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thu sach » tu sach, thuat sach, thuoc sach
van chat » cao chat
lang van » dang van, tang van, hoang van
tu cach » tu cac
van hoi » van hoa, van hoc, van hoe
ky lang » ky nang, ky dang, ky tang
du tren » dua tren, dau tren, duc tren
xuc va » tuc va, luc va, xac va
vi du » vi dum, va du, ve 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 van chat ((xuc va) OR (duc va)) hanh vi du tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) ky lang van hoi. hieu van chat ((xuc va) OR (duc va)) hanh vi du tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (thu sach)) ky lang van hoi. hieu van chat ((xuc va) OR (duc va)) hanh vi du tren".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) ky lang van hoi. hieu van chat ((xuc va) OR (duc va)) hanh vi du tren*.