Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
canh tay » canh tac, thanh tay, anh ta
chat hoc » chat hoa, chat thom, cho hoc
sanh ty » sach ty
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu van
hieu va » lieu va, hieu qua
hoc gia » hoc giao, hoc giai, toc gia
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: do ((sanh ty) OR (canh tay)) xang xa hoi. ((hieu ve) or (hieu va)) chat hoc gia thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: do ((sanh ty) OR (canh tay)) xang xa hoi. ((hieu ve) OR (hieu va)) chat hoc gia thanh dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "do ((sanh ty) OR (canh tay)) xang xa hoi. ((hieu ve) or (hieu va)) chat hoc gia thanh dai cua tre*".