Perhaps you should try some spelling variations:
sach kha » sach nha, sach ha, sach tham
kha nang » phap nang, ky nang, ki nang
thanh de » hanh de, thanh ve, thanh do
thinh le » trinh ly
su sach » so sach, vu sach
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ma hoi » mai hoi, ma hoa, me hoi
ve cam » ve cham, ve cac, va cam

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 kha nang ((ma hoi) OR (xa hoi)). hieu ve cam duc va ((thinh le) or (thanh de)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach kha nang ((ma hoi) OR (xa hoi)). hieu ve cam duc va ((thinh le) OR (thanh de)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach kha nang ((ma hoi) OR (xa hoi)). hieu ve cam duc va ((thinh le) or (thanh de)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach kha nang ((ma hoi) OR (xa hoi)). hieu ve cam duc va ((thinh le) or (thanh de)) cua tre*.