Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
sang mai » sang ma, sang tai, lang mai
cham xuc » cam xuc, chat xuc, pham duc
sach ky » sac ky, sach y, sach ty
hanh ca » hanh cac, hanh cat, hanh cua
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va
ky sang » ky nang, ky dang, ky tang
su viet » so viet
ca su » cua su, cao su, ca sau

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