Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
te sach » toc sach
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
nam xuc » cam xuc, nam xua, nam thuc
va dinh » van dinh, va kinh, va tinh
dinh va » dinh van, dinh ve, tinh va
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
xuc va » duc va, tuc va, luc va

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) or (ky tang)) xa hoi. hieu van nam xuc va dinh va ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky lang) OR (ky tang)) xa hoi. hieu van nam xuc va dinh va ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky lang) or (ky tang)) xa hoi. hieu van nam xuc va dinh va ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky lang) or (ky tang)) xa hoi. hieu van nam xuc va dinh va ((cuu tre) OR (cua tre))*.