Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
van hanh » van thanh, ban hanh, van anh
hanh ve » hanh vi, hanh va, hanh kem
cau luc » cau truc, cau phuc
cam luc » cam xuc
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
sac ky » cac ky, sai ky
ve va » ve van, te va, ke va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sac ky) or (sach y)) lang xa hoi. hieu ve ((cam luc) or (cau luc)) van hanh ve va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sac ky) OR (sach y)) lang xa hoi. hieu ve ((cam luc) OR (cau luc)) van hanh ve va trien.
• Adding a wildcard symbol may retrieve word variants: te ((sac ky) or (sach y)) lang xa hoi. hieu ve ((cam luc) or (cau luc)) van hanh ve va trien*.