Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tham xuc » tham nuoc, tham thuc, pham duc
hieu va » lieu va, hieu qua
hanh ki » hanh vi, hanh ky, hanh kien
xuc van » duc van, luc van, vuc van
va tham » van tham, va cham, va thanh
tu sach » thu sach, su sach, te sach
sach vu » sach va, sach tu, sach uu
mai hoi » mai khoi, dai hoi, lai hoi
vu nang » vuc nang, va nang, vu dang
su viet » so viet
ma hoi » xa hoi, ma hoa, me hoi
ki su » ky su

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 vu nang ((ma hoi) OR (mai hoi)). hieu va tham xuc van hanh ki su viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach vu nang ((ma hoi) OR (mai hoi)). hieu va tham xuc van hanh ki su viet".
• Adding a wildcard symbol may retrieve word variants: tu sach vu nang ((ma hoi) OR (mai hoi)). hieu va tham xuc van hanh ki su viet*.