Perhaps you should try some spelling variations:
hanh kien » danh kien, anh kien, thanh vien
su triet » su viet, su tien, ve triet
nang mai » nang ma, nang tai, lang mai
duc ban » duc tan, duc van, dua ban
hanh ki » hanh vi, hanh ky, thanh kim
tu sach » thu sach, su sach, te sach
sach vu » sach va, sach tu, sach uu
xuc ban » cuc ban, quoc ban, xuat ban
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
vu nang » vuc nang, va nang, vu dang
va cam » va cham, va cac, va cao

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 mai hoi. hieu va cam ((xuc ban) OR (duc ban)) ((hanh ki) or (hanh kien)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach vu nang mai hoi. hieu va cam ((xuc ban) OR (duc ban)) ((hanh ki) OR (hanh kien)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach vu nang mai hoi. hieu va cam ((xuc ban) OR (duc ban)) ((hanh ki) or (hanh kien)) su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach vu nang mai hoi. hieu va cam ((xuc ban) OR (duc ban)) ((hanh ki) or (hanh kien)) su triet*.