Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
doanh va » doan va, doanh tai, doanh cua
cua tre » cua te, cuu tre, dua tren
luu van » cuu van, luan van, luu hanh
sach vu » sach va, sach tu, sach uu
tu sach » thu sach, su sach, te sach
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
nang ma » tang ma, sang ma, nang cao
vu nang » vuc nang, va nang, vu dang
luc vay » luc va, luc van, luoc van
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 vu cham ((luc vay) or (luu van)) doanh va ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach vu nang ma hoi. hieu vu cham ((luc vay) OR (luu van)) doanh va ((cua tre) OR (cua triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach vu nang ma hoi. hieu vu cham ((luc vay) or (luu van)) doanh va ((cua tre) OR (cua triet))*".