Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
va nang » van nang, da nang, cam nang
va hang » van hang, va lang, va hanh
sach ty » sach y, sach tu, sach thu
co sach » bo sach, cuon sach, hoc sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
cam tuc » cam xuc, cam tu, nam thuc
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 nang xa hoi. ((hieu ve) or (hieu qua)) cam tuc ((va hang) OR (va nang)) di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ty nang xa hoi. ((hieu ve) OR (hieu qua)) cam tuc ((va hang) OR (va nang)) di su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ty nang xa hoi. ((hieu ve) or (hieu qua)) cam tuc ((va hang) OR (va nang)) di su triet".
• Adding a wildcard symbol may retrieve word variants: co sach ty nang xa hoi. ((hieu ve) or (hieu qua)) cam tuc ((va hang) OR (va nang)) di su triet*.