Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va, hieu van
duc van » duc va, duc tan, duc manh
cac duc » cac du, cao duc, cac dac
tu sach » thu sach, su sach, te sach
nang ra » nang ma, lang ra, nang ro
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
tu ban » thu ban, te ban

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 (tu ban)) ky ((nang x) or (nang ra)) lai. hieu ve cac duc van hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (tu ban)) ky ((nang x) OR (nang ra)) lai. hieu ve cac duc van hanh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (tu ban)) ky ((nang x) or (nang ra)) lai. hieu ve cac duc van hanh thai cua tre*.