Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
cac quoc » cac nuoc, cac cuoc, cao quoc
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
quoc ban » quoc bao, quoc lan, quoc quan
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
sac ky » cac ky, sai ky
vai su » va su, van su, lai su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach y) or (sac ky)) ((nang xa) or (nang x)) hoi. hieu ve cac quoc ban hanh vai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach y) OR (sac ky)) ((nang xa) OR (nang x)) hoi. hieu ve cac quoc ban hanh vai su triet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sac ky)) ((nang xa) or (nang x)) hoi. hieu ve cac quoc ban hanh vai su triet*.