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