Perhaps you should try some spelling variations:
thien lang » thien bang, thien dang, thien nang
hieu van » hieu va, thien van, lieu va
dua tren » dung tren
su sach » vu sach
dinh vi » dinh ve, dinh viet, dinh tri
va dinh » van dinh, va kinh, va tinh
nam xuc » cam xuc, nam xua, nam thuc
lang xa » lang ha, dang xay, lang van
so sach » so sanh, bo sach, co sach
cuu tre » cua tre, cau tren, cau treo
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: ((su sach) OR (so sach)) thien lang xa hoi. hieu van nam xuc va dinh vi ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) thien lang xa hoi. hieu van nam xuc va dinh vi ((dua tren) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) thien lang xa hoi. hieu van nam xuc va dinh vi ((dua tren) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) thien lang xa hoi. hieu van nam xuc va dinh vi ((dua tren) or (cuu tre))*.