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
tu sach » thu sach, su sach, te sach
hanh ki » hanh vi, hanh ky, hanh kien
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
su viet » so viet
va cam » va cham, va cac, va cao
ma hoi » mai hoi, xa hoi, ma hoa

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. hieu va cam ((xuc van) or (duc van)) hanh ki ((su triet) OR (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach vuc nang ma hoi. hieu va cam ((xuc van) OR (duc van)) hanh ki ((su triet) OR (su viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach vuc nang ma hoi. hieu va cam ((xuc van) or (duc van)) hanh ki ((su triet) OR (su viet))*".