Perhaps you should try some spelling variations:
sach vuc » sach duoc, sach nuoc, sach truc
vuc nang » cuc nang, vu nang, chuc nang
tham xuc » tham nuoc, tham thuc, pham duc
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
xuc van » duc van, luc van, vuc van
hanh ki » hanh vi, hanh ky, hanh kien
su viet » so viet
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 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 vuc nang ((ma hoi) OR (ma hoa)). hieu va tham xuc van hanh ki su viet".
• Adding a wildcard symbol may retrieve word variants: tu sach vuc nang ((ma hoi) OR (ma hoa)). hieu va tham xuc van hanh ki su viet*.