Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
van hanh » van thanh, ban hanh, van anh
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, te sach, tu cach
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
su sach » so sach, vu sach
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) OR (su sach)) ky dang 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) OR (su sach)) ky dang 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) OR (su sach)) ky dang xa hoi. hieu ((ve cam) or (ve cham)) tuc van hanh vu va triet*".