Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hoc viet » hoc hien
ky tang » ky nang, ky dang, kho tang
mai hoi » mai khoi, lai hoi, mai doi
dai hoi » dai hoc, dai hai, dai moi
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, vuc van
su sai » su tai, su hai, su dai
sai ky » sac ky
ve cam » ve cham, ve cac, va cam
vi hoc » li hoc, va hoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sai ky tang ((mai hoi) OR (dai hoi)). hieu ve cam xuc van hanh vi hoc viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky tang ((mai hoi) OR (dai hoi)). hieu ve cam xuc van hanh vi hoc viet".
• Adding a wildcard symbol may retrieve word variants: su sai ky tang ((mai hoi) OR (dai hoi)). hieu ve cam xuc van hanh vi hoc viet*.