Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
cua tre » cua te, cuu tre, cua triet
tai cua » thai cua, tai cuc, tri cua
va hanh » van hanh, va thanh, va danh
va chat » van chat, va phat, cao chat
va cham » va tham
ky lang » ky nang, ky dang, ky tang
bai ky » ban ky, sai ky, bac ky
va hoi » va hoc, va hoa
te bai » te bao, te tai, 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: te bai ky lang ((va hoi) or (xa hoi)). hieu ((va cham) OR (va chat)) duc va hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te bai ky lang ((va hoi) OR (xa hoi)). hieu ((va cham) OR (va chat)) duc va hanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te bai ky lang ((va hoi) or (xa hoi)). hieu ((va cham) OR (va chat)) duc va hanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: te bai ky lang ((va hoi) or (xa hoi)). hieu ((va cham) OR (va chat)) duc va hanh tai cua tre*.