Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
su sach » vu sach
san cua » sang cua, ban cua, dan cua
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
nang co » nang doc, nang noi, nang hoc
so sach » so sanh, bo sach, co sach
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) or (so sach)) ty ((nang co) or (nang cao)) loi. hieu ve cam duc va thanh san cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ty ((nang co) OR (nang cao)) loi. hieu ve cam duc va thanh san cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ty ((nang co) or (nang cao)) loi. hieu ve cam duc va thanh san cua tre*.