Perhaps you should try some spelling variations:
ve triet » va trien
su triet » su viet, su tien
duc van » duc va, duc tan, duc manh
hanh ki » hanh vi, hanh ky, hanh kien
tu sach » thu sach, su sach, te sach
sach vu » sach va, sach tu, sach uu
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
vu nang » vuc nang, va nang, vu dang
xuc van » luc van, vuc van, xuc ban
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 vu nang ma hoi. hieu va cam ((xuc van) or (duc van)) hanh ki ((su triet) OR (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach vu nang ma hoi. hieu va cam ((xuc van) OR (duc van)) hanh ki ((su triet) OR (ve triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach vu nang ma hoi. hieu va cam ((xuc van) or (duc van)) hanh ki ((su triet) OR (ve triet))*".