Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
duc manh » suc manh, duc anh, duc minh
quoc ban » quoc bao, quoc lan, quoc quan
tu sach » thu sach, te sach, tu cach
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang ho » nang hoc, nang co, tang ho
su sach » so sach, vu sach
ho hai » hoc hai, pho hai, cho hai
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) or (su sach)) ky nang ho hai. hieu ve cac ((quoc ban) or (duc manh)) hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang ho hai. hieu ve cac ((quoc ban) OR (duc manh)) hanh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang ho hai. hieu ve cac ((quoc ban) or (duc manh)) hanh thai cua tre*.