Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hanh lai » hanh lam, hanh tai, thanh lap
bach ky » bac ky
lai cua » dai cua, hai cua, lai chau
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
cac co » cac cong
cac lo » cac lop, cac bo, cac ho
cua te » cua tu

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

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