Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham xuc » cam xuc, chat xuc, cham soc
sach ky » sac ky, sach y, sach ty
xuc va » duc va, tuc va, luc va
va han » va phan, van han, va hanh
tai va » thai va, tri va, dai va
x hoi » xa hoi, o hoi, x ho
thiet » thieu

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) or (cac ky)) nang x hoi. hieu van cham xuc va han ((tai va) OR (mai va)) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (cac ky)) nang x hoi. hieu van cham xuc va han ((tai va) OR (mai va)) thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (cac ky)) nang x hoi. hieu van cham xuc va han ((tai va) OR (mai va)) thiet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (cac ky)) nang x hoi. hieu van cham xuc va han ((tai va) OR (mai va)) thiet*.