Perhaps you should try some spelling variations:
ban tinh » ban thanh, quan tinh, ban hanh
toc sach » hoc sach, doc sach, thuoc sach
hieu ve » hieu va, hieu van
tinh vi » trinh vi, tinh voi, tinh va
cuc ban » cua ban, cac ban, cuu ban
cam cuc » cam xuc, cham cuu, pham cuc
tu sach » thu sach, su sach, tu cach
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
cuu tre » cua tre, cau tren, cau treo
ve cam » ve cham, ve cac, va cam
vi cuu » vi luu, vinh cuu

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 tang xa hoi. hieu ve cam cuc ban tinh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((te sach) OR (toc sach)))) ky tang xa hoi. hieu ve cam cuc ban tinh vi cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (((te sach) OR (toc sach)))) ky tang xa hoi. hieu ve cam cuc ban tinh vi cuu tre*".