Perhaps you should try some spelling variations:
thai hanh » thai thanh, thi hanh, thai hang
hanh vai » hanh vi, hanh va, hanh tai
cua tre » cua te, cuu tre, cua triet
vai cua » dai cua, hai cua, lai cua
cac toc » cac toi, cac nuoc, cac thoi
hieu va » lieu va, hieu qua
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
tu ban » thu ban, te ban
vu san » va san, vu ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu san) or (tu ban)) ky ((nang ma) OR (sang ma)) hoi. hieu va cac toc thai hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu san) OR (tu ban)) ky ((nang ma) OR (sang ma)) hoi. hieu va cac toc thai hanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu san) or (tu ban)) ky ((nang ma) OR (sang ma)) hoi. hieu va cac toc thai hanh vai cua tre*".