Perhaps you should try some spelling variations:
cham xuc » cam xuc, chat xuc, cham soc
hanh tri » thanh tri, hanh tai, hanh trinh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, mang may
sang ma » tang ma, sang tao, mang may
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
va hanh » van hanh, va thanh, va danh
xuc va » duc va, tuc va, luc 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 ((((nang ma) OR (sang ma))) or (nang cao)) hoi. hieu vu cham xuc va hanh tri va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((((nang ma) OR (sang ma))) OR (nang cao)) hoi. hieu vu cham xuc va hanh tri va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((((nang ma) OR (sang ma))) or (nang cao)) hoi. hieu vu cham xuc va hanh tri va thiet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((((nang ma) OR (sang ma))) or (nang cao)) hoi. hieu vu cham xuc va hanh tri va thiet*.