Perhaps you should try some spelling variations:
sang mai » sang ma, sang tai, lang mai
cham xuc » cam xuc, chat xuc, cham soc
danh tai » doanh tai, dinh tai, hanh tai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
mai hoi » mai khoi, dai hoi, lai hoi
hieu vu » hieu va, hieu ve, dieu vu
hieu su » hieu sau, tieu su, hieu so
va danh » va dinh, va dan, va hanh
xuc va » duc va, tuc va, luc va
tai va » thai va, mai va, tri va
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: tu sach ky sang mai hoi. ((hieu vu) or (hieu su)) cham xuc va danh tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang mai hoi. ((hieu vu) OR (hieu su)) cham xuc va danh tai va thiet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang mai hoi. ((hieu vu) or (hieu su)) cham xuc va danh tai va thiet*.