Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
tu sach » thu sach, su sach, te sach
cau luc » cau truc, cau phuc
cam luc » cam xuc
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
mai hoi » mai khoi, lai hoi, mai doi
dai hoi » dai hoc, dai hai, dai moi
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet

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 ty nang ((mai hoi) OR (dai hoi)). hieu ve ((cam luc) or (cau luc)) gia thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((mai hoi) OR (dai hoi)). hieu ve ((cam luc) OR (cau luc)) gia thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((mai hoi) OR (dai hoi)). hieu ve ((cam luc) or (cau luc)) gia thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((mai hoi) OR (dai hoi)). hieu ve ((cam luc) or (cau luc)) gia thanh dai cua tre*.