Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
cua dang » cua cong, cua ban
hanh ki » hanh vi, hanh ky, hanh kien
xuc van » duc van, luc van, vuc van
hieu va » lieu va, hieu qua
su sach » so sach, vu sach
vu dang » su dang, vu quang
va nang » van nang, da nang, cam nang
mai hoi » mai khoi, dai hoi, lai hoi
va cam » va cham, va cac, va cao
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: su sach ((va nang) or (((vu dang) OR (cua dang)))) mai hoi. hieu va cam xuc van hanh ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((va nang) OR (((vu dang) OR (cua dang)))) mai hoi. hieu va cam xuc van hanh ki su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((va nang) or (((vu dang) OR (cua dang)))) mai hoi. hieu va cam xuc van hanh ki su triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((va nang) or (((vu dang) OR (cua dang)))) mai hoi. hieu va cam xuc van hanh ki su triet*.