Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
va dinh » van dinh, va kinh, va tinh
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va
dinh vi » dinh ve, dinh viet, dinh tri
cac xuc » cam xuc, cac nuoc, chat xuc
vi cua » vai cua, di cua
cua te » cua tu
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: ((tu sach) or (thuat sach)) ky tang xa hoi. ((hieu ve) OR (hieu van)) cac xuc va dinh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) ky tang xa hoi. ((hieu ve) OR (hieu van)) cac xuc va dinh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuat sach)) ky tang xa hoi. ((hieu ve) OR (hieu van)) cac xuc va dinh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) ky tang xa hoi. ((hieu ve) OR (hieu van)) cac xuc va dinh vi cua te*.