Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
cua tre » cua te, cua triet, dua tren
xuc van » duc van, luc van, vuc van
cuu tre » cau tren, cau treo
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
ma hoi » mai hoi, ma hoa, me hoi
ve cac » va cac, vien cac

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 nang ((ma hoi) or (xa hoi)). hieu ve cac xuc van hanh lai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu nang ((ma hoi) OR (xa hoi)). hieu ve cac xuc van hanh lai ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu nang ((ma hoi) or (xa hoi)). hieu ve cac xuc van hanh lai ((cua tre) OR (cuu tre))*".