Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
chat xuc » chat huu, cam xuc, chao xu
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
va hanh » va thanh, va danh, ban hanh
hai va » hai van, thai va, hoi 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 mai hoi. hieu ve chat xuc ((va hanh) or (van hanh)) hai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang mai hoi. hieu ve chat xuc ((va hanh) OR (van hanh)) hai va thiet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang mai hoi. hieu ve chat xuc ((va hanh) or (van hanh)) hai va thiet*.