Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
tan thanh » tran thanh, tang thanh, toan thanh
thai cua » than cua, tai cuc, tri cua
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, lai hoi
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ky tang » ky nang, ky dang, kho tang
ma hoi » xa hoi, ma hoa, me hoi
ve cam » ve cham, ve cac, va cam
su xac » pu xac, su cac

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 (su xac)) ky tang ((ma hoi) or (mai hoi)). hieu ve cam duc tan thanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (su xac)) ky tang ((ma hoi) OR (mai hoi)). hieu ve cam duc tan thanh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (su xac)) ky tang ((ma hoi) or (mai hoi)). hieu ve cam duc tan thanh thai cua tre*.