Perhaps you should try some spelling variations:
cuon sach » duong sach, co sach, nuoc sach
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien, ve triet
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
cam tuc » cam xuc, cam tu, nam thuc
xa hang » va hang, xa bang, xa hung
hang di » hang doi, hang vi, hang dien
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: ((cuon sach) or (cuoc cach)) ty nang xa hoi. ((hieu van) or (hieu qua)) cam tuc xa hang di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((cuon sach) OR (cuoc cach)) ty nang xa hoi. ((hieu van) OR (hieu qua)) cam tuc xa hang di su triet.
• Adding a wildcard symbol may retrieve word variants: ((cuon sach) or (cuoc cach)) ty nang xa hoi. ((hieu van) or (hieu qua)) cam tuc xa hang di su triet*.