Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
nang xa » lang xa, nang ma, mang xa
hieu va » lieu va
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
cac co » cac cong
co va » co ma, do va, so va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky ((nang xa) OR (nang x)) hoi. ((hieu va) or (hieu qua)) cac co va hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky ((nang xa) OR (nang x)) hoi. ((hieu va) OR (hieu qua)) cac co va hanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky ((nang xa) OR (nang x)) hoi. ((hieu va) or (hieu qua)) cac co va hanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu cac ky ((nang xa) OR (nang x)) hoi. ((hieu va) or (hieu qua)) cac co va hanh thai cua tre*.