Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
van hanh » van thanh, ban hanh, van anh
boi hoat » toi hoat, doi hoat, voi hoat
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
boi hoa » bi hoa, toi hoat
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang mai hoi. hieu ve cac xuc van hanh ((boi hoa) or (boi hoat)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang mai hoi. hieu ve cac xuc van hanh ((boi hoa) OR (boi hoat)) viet.
• Adding a wildcard symbol may retrieve word variants: so sach ky nang mai hoi. hieu ve cac xuc van hanh ((boi hoa) or (boi hoat)) viet*.