Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
ky tang » ky dang, kho tang, ky trong
van cam » van nam, van lam, van cau
cam tuc » cam xuc, cam tu, nam thuc
dan tai » van tai, dan thi, han tai
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau
tai su » tai so, tai tu, 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: su sach ((ky tang) or (ky nang)) xa hoi. hieu van cam tuc va dan tai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky tang) OR (ky nang)) xa hoi. hieu van cam tuc va dan tai su triet.
• Adding a wildcard symbol may retrieve word variants: su sach ((ky tang) or (ky nang)) xa hoi. hieu van cam tuc va dan tai su triet*.