Perhaps you should try some spelling variations:
thien van » thi van
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, lieu va, hieu ve
tu sach » su sach, te sach, tu cach
dinh ve » dinh ket, dinh van
va dinh » van dinh, va kinh, va tinh
lam xuc » cam xuc, lam duoc
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
ve cua » le cua, de cua, te cua

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