Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
va cham » va chat, va tham
cuc ban » cua ban, cac ban, cuu ban
cua tre » cua te, cuu tre, cua triet
nang ho » nang hoc, nang co, tang ho
y nang » ky nang, ly nang, v nang
va cam » va cac, va cao, va cai
ho hai » hoc hai, pho hai, cho hai
anh di » danh di, xanh di, anh du

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 ho hai. hieu ((va cam) OR (va cham)) cuc ban ((anh di) or (anh d)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ho hai. hieu ((va cam) OR (va cham)) cuc ban ((anh di) OR (anh d)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ho hai. hieu ((va cam) OR (va cham)) cuc ban ((anh di) or (anh d)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ho hai. hieu ((va cam) OR (va cham)) cuc ban ((anh di) or (anh d)) cua tre*.