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