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