Perhaps you should try some spelling variations:
sach vuc » sach duoc, sach nuoc, sach truc
vuc nang » cuc nang, vu nang, chuc nang
su triet » su tien, ve triet
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
luc van » luoc van, luu van, duc van
cam luc » cam xuc, cau luc
su viet » so viet
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, me hoi
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 vuc nang ((ma hoi) or (ma hoa)). hieu va cam luc van hanh vi ((su triet) OR (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach vuc nang ((ma hoi) OR (ma hoa)). hieu va cam luc van hanh vi ((su triet) OR (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 cam luc van hanh vi ((su triet) OR (su viet))*".