Perhaps you should try some spelling variations:
hanh cac » hang cac, hanh cat, nhanh cay
cham xuc » cam xuc, chat xuc, pham duc
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
dai hoi » dai hoc, dai hai, dai moi
mai hoi » mai khoi, lai hoi, mai doi
su viet » so viet
cac su » cach su, cac sau, cac du

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 ((mai hoi) or (dai hoi)). hieu ve ((cham xuc) or (cham soc)) va hanh cac su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((mai hoi) OR (dai hoi)). hieu ve ((cham xuc) OR (cham soc)) va hanh cac su viet.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((mai hoi) or (dai hoi)). hieu ve ((cham xuc) or (cham soc)) va hanh cac su viet*.