Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh lap » thanh san, phan lap, thanh hai
van chat » cao chat
tu sach » thu sach, su sach, te sach
lap cho » cap cho, tap cho, lai cho
hoc ban » hoc bang, hoc dan, hoc bai
van lam » van nam
cho tre » cho thue, khoe tre
van cam » van nam, van cau, van dam
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
o hai » co hai, so hai, o lai

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 y nang o hai. hieu ((((van cam) OR (van lam))) or (van chat)) hoc ban thanh lap cho tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang o hai. hieu ((((van cam) OR (van lam))) OR (van chat)) hoc ban thanh lap cho tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang o hai. hieu ((((van cam) OR (van lam))) or (van chat)) hoc ban thanh lap cho tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang o hai. hieu ((((van cam) OR (van lam))) or (van chat)) hoc ban thanh lap cho tre*.