Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, anh thai
thien van » thi van
hanh tai » thanh tai, hang tai, han tai
co sach » bo sach, cuon sach, hoc sach
duc van » duc va, duc tan, duc manh
hac duc » hoc duc, ha duc, thach duc
van hac » van hoc, van ha, van hai
cua tre » cua te, cuu tre, cua triet
ky van » ly van, ty van
ky va » ly va, ke va, my va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: co sach ((ky van) or (ky va)) xa hoi. thien van hac duc van ((hanh thai) or (hanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ((ky van) OR (ky va)) xa hoi. thien van hac duc van ((hanh thai) OR (hanh tai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: co sach ((ky van) or (ky va)) xa hoi. thien van hac duc van ((hanh thai) or (hanh tai)) cua tre*.