Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dinh dai » dinh dat, sinh dai, dinh dao
phuc quy » phu quy, phuc vu, hoc quy
vien cac » vien bach, vien dai, vien da
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
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: ((thu sach) or (te sach)) ky tang xa hoi. hieu ((ve cac) OR (vien cac)) phuc quy dinh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (te sach)) ky tang xa hoi. hieu ((ve cac) OR (vien cac)) phuc quy dinh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (te sach)) ky tang xa hoi. hieu ((ve cac) OR (vien cac)) phuc quy dinh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (te sach)) ky tang xa hoi. hieu ((ve cac) OR (vien cac)) phuc quy dinh dai cua tre*.