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 viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
luc van » luoc van, duc van, luc va
luu van » cuu van, luan van, luu hanh
hanh ki » hanh vi, hanh ky, hanh kien
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
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 vuc nang ma hoi. hieu va cam ((luc van) OR (luu van)) hanh ki su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach vuc nang ma hoi. hieu va cam ((luc van) OR (luu van)) hanh ki su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach vuc nang ma hoi. hieu va cam ((luc van) OR (luu van)) hanh ki su triet*.