Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
tinh via » tinh gia, tinh va, tinh vi
hay tinh » may tinh, ha tinh, huy tinh
toc sach » hoc sach, doc sach, thuoc sach
vien cac » vien bach, vien dai, vien da
tu sach » thu sach, su sach, tu cach
via cua » gia cua, gian cua, giau cua
cac xuc » cam xuc, cac nuoc, chat xuc
cua tre » cua te, cuu tre, cua triet
dang ma » dang mau, dang mam, dang mat
ky dang » ky nang, ky danh
ma hoi » mai hoi, xa hoi, ma hoa

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) OR (toc sach)))) ky dang ma hoi. hieu vien cac xuc hay tinh via cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((te sach) OR (toc sach)))) ky dang ma hoi. hieu vien cac xuc hay tinh via cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (((te sach) OR (toc sach)))) ky dang ma hoi. hieu vien cac xuc hay tinh via cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((te sach) OR (toc sach)))) ky dang ma hoi. hieu vien cac xuc hay tinh via cua tre*.