Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vai » thanh hai, thanh van, thanh tai
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
cac duc » cac du, cao duc, cac dac
cua tre » cuu tre, cua triet, dua tren
duc ban » duc tan, duc van, dua ban
hieu ve » hieu va, hieu van
tu nang » tru nang, tu nong, tu nano
ve cac » va cac, vien cac
nang o » nang co, nang ho, nang ro
cua te » cua tu
o hoc » co hoc, mo hoc, so hoc

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)) tu nang o hoc. hieu ve cac duc ban thanh vai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) tu nang o hoc. hieu ve cac duc ban thanh vai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) tu nang o hoc. hieu ve cac duc ban thanh vai ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) tu nang o hoc. hieu ve cac duc ban thanh vai ((cua tre) or (cua te))*.