Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
vuc nang » cuc nang, vu nang, chuc nang
tham xuc » tham nuoc, tham thuc, pham duc
tu sach » thu sach, te sach, tu cach
hanh ki » hanh vi, hanh ky, hanh kien
xuc van » duc van, luc van, vuc van
va tham » van tham, va cham, va thanh
hieu va » lieu va, hieu qua
su viet » so viet
su sach » so sach, vu sach
ma hoi » mai hoi, xa hoi, 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) OR (su sach)) vuc nang ((ma hoi) or (ma hoa)). hieu va tham xuc van hanh ki su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) vuc nang ((ma hoi) OR (ma hoa)). hieu va tham xuc van hanh ki su viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) vuc nang ((ma hoi) or (ma hoa)). hieu va tham xuc van hanh ki su viet*".