Perhaps you should try some spelling variations:
dinh dat » dinh ket, dinh van, dinh lam
phuc quy » phu quy, phuc vu, hoc quy
vien cac » vien bach, vien dai, vien da
tu sach » thu sach, su sach, tu cach
dat cua » dai cua, day cua, mat cua
cua tre » cua te, cuu tre, cua triet
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
te sach » toc sach
ve cac » va cac

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