Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
hanh vu » hanh vi, hanh va, hanh tu
tuc van » thuc van, truc van, tuc va
ve cham » va cham, ve chat, vu cham
tu sach » thu sach, su sach, te sach
dinh xa » dinh ba, dinh va, binh xa
danh xa » danh ca, canh xa, dan xa
ve cam » ve cac, va cam, ve cai
vu va » vu van, tu va, su va

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 ((danh xa) OR (dinh xa)) hoi. hieu ((ve cam) or (ve cham)) tuc van hanh vu va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((danh xa) OR (dinh xa)) hoi. hieu ((ve cam) OR (ve cham)) tuc van hanh vu va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((danh xa) OR (dinh xa)) hoi. hieu ((ve cam) or (ve cham)) tuc van hanh vu va triet*".