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
cham xuc » cam xuc, chat xuc, cham soc
hanh ki » hanh vi, hanh ky, hanh kien
xuc van » duc van, luc van, vuc van
va cham » va chat, va tham
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, te sach
vu dang » su dang, vu quang
mai hoi » mai khoi, dai hoi, lai hoi
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 dang) OR (cua dang)) ((ma hoi) or (mai hoi)). hieu va cham xuc van hanh ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((vu dang) OR (cua dang)) ((ma hoi) OR (mai hoi)). hieu va cham xuc van hanh ki su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((vu dang) OR (cua dang)) ((ma hoi) or (mai hoi)). hieu va cham xuc van hanh ki su triet*".