Perhaps you should try some spelling variations:
thu tang » thu trang, thu thang, thu hang
hanh vin » hanh tin, hanh van, thanh vien
sach thu » sach thue, sach thieu, sach tham
tu sach » thu sach, su sach, te sach
xuc van » duc van, luc van, vuc van
cua tre » cua te, cuu tre, cua triet
tang ma » mang may, tang van
ma hoi » mai hoi, xa hoi, ma hoa

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 thu tang ma hoi. hieu ((van chat) OR (cao chat)) xuc van ((hanh vin) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu tang ma hoi. hieu ((van chat) OR (cao chat)) xuc van ((hanh vin) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu tang ma hoi. hieu ((van chat) OR (cao chat)) xuc van ((hanh vin) or (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach thu tang ma hoi. hieu ((van chat) OR (cao chat)) xuc van ((hanh vin) or (hanh vi)) cua tre*.