Perhaps you should try some spelling variations:
cham xuc » cam xuc, chat xuc, cham soc
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va han » va phan, van han, va hanh
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: su sach ky ((nang ma) or (nang x)) hoi. hieu va cham xuc ((va han) or (van hanh)) tri va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang ma) OR (nang x)) hoi. hieu va cham xuc ((va han) OR (van hanh)) tri va thiet.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang ma) or (nang x)) hoi. hieu va cham xuc ((va han) or (van hanh)) tri va thiet*.