Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cham xuc » cam xuc, chat xuc, cham soc
van phan » van phong, van thanh, luan phan
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
van han » van hanh, van nhan, van hoan
tai va » thai va, mai va, tri 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 nang x hoi. ((hieu ve) OR (hieu van)) cham xuc ((van han) or (van phan)) tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. ((hieu ve) OR (hieu van)) cham xuc ((van han) OR (van phan)) tai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. ((hieu ve) OR (hieu van)) cham xuc ((van han) or (van phan)) tai va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. ((hieu ve) OR (hieu van)) cham xuc ((van han) or (van phan)) tai va thiet*.