Perhaps you should try some spelling variations:
thien van » thi van
thanh vai » thanh hai, thanh tai, thanh oai
thanh van » thanh san, thanh toan, thanh phan
van pham » san pham, van phan, van phat
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang ((ma hoi) OR (xa hoi)). thien van pham duc tan ((thanh vai) or (thanh van)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((ma hoi) OR (xa hoi)). thien van pham duc tan ((thanh vai) OR (thanh van)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ((ma hoi) OR (xa hoi)). thien van pham duc tan ((thanh vai) or (thanh van)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((ma hoi) OR (xa hoi)). thien van pham duc tan ((thanh vai) or (thanh van)) cua tre*.