Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
sach ty » sach tu, sach thu, xach tay
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va lang » va nang, hoa lang
lang di » lang dai, hang di, lang du
cam tu » cam thu, nam tu, dam tu
di su » doi su, ki su, da su

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

• Performing a fuzzy search may retrieve terms with similar spellings: co ((sach ty) or (sach y)) nang xa hoi. ((hieu ve) or (hieu qua)) cam tu va lang di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co ((sach ty) OR (sach y)) nang xa hoi. ((hieu ve) OR (hieu qua)) cam tu va lang di su triet.
• Adding a wildcard symbol may retrieve word variants: co ((sach ty) or (sach y)) nang xa hoi. ((hieu ve) or (hieu qua)) cam tu va lang di su triet*.