Perhaps you should try some spelling variations:
danh tai » doanh tai, dinh tai, hanh tai
cham xuc » cam xuc, chat xuc, cham soc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, va hanh
hieu su » hieu sau, tieu su, hieu so
hieu va » lieu va, hieu qua
sang ma » tang ma, nang ma, sang tao
hieu vu » hieu ve, dieu vu, hieu qua
ky sang » ky nang, ky dang, ky tang
ma hoi » mai hoi, xa hoi, ma hoa
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 ma hoi. ((((hieu vu) OR (hieu va))) 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 ma hoi. ((((hieu vu) OR (hieu va))) OR (hieu su)) cham xuc va danh tai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky sang ma hoi. ((((hieu vu) OR (hieu va))) or (hieu su)) cham xuc va danh tai va thiet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang ma hoi. ((((hieu vu) OR (hieu va))) or (hieu su)) cham xuc va danh tai va thiet*.