Perhaps you should try some spelling variations:
doi hoat » toi hoat, doi hoa, doi hoac
nang mai » nang ma, nang tai, lang mai
voi hoat » toi hoat, vo hoat, voi hoa
van hanh » van thanh, ban hanh, van anh
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, vuc van
su xac » pu xac, su cac
su cao » cu cao, vu cao, su co
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su xac) or (su cao)) ky nang mai hoi. hieu ve cam xuc van hanh ((voi hoat) OR (doi hoat)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su xac) OR (su cao)) ky nang mai hoi. hieu ve cam xuc van hanh ((voi hoat) OR (doi hoat)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su xac) or (su cao)) ky nang mai hoi. hieu ve cam xuc van hanh ((voi hoat) OR (doi hoat)) viet".
• Adding a wildcard symbol may retrieve word variants: ((su xac) or (su cao)) ky nang mai hoi. hieu ve cam xuc van hanh ((voi hoat) OR (doi hoat)) viet*.