Perhaps you should try some spelling variations:
qua chao » qua cham, qua cho, qua khao
thai cua » than cua, tai cuc, tri cua
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
cua tre » cua te, cuu tre, cua triet
su cac » tu cac, su cao, su can

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

• Performing a fuzzy search may retrieve terms with similar spellings: su cac ky ((nang xa) or (nang ma)) hoi. hieu qua chao xu ((va hanh) or (va danh)) thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cac ky ((nang xa) OR (nang ma)) hoi. hieu qua chao xu ((va hanh) OR (va danh)) thai cua tre.
• Adding a wildcard symbol may retrieve word variants: su cac ky ((nang xa) or (nang ma)) hoi. hieu qua chao xu ((va hanh) or (va danh)) thai cua tre*.