Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
doanh cua » doanh luan
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, dua tren
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
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 ky nang ma hoi. hieu va cac ((xuc va) or (luc va)) doanh cua ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. hieu va cac ((xuc va) OR (luc va)) doanh cua ((cua tre) OR (cua triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ma hoi. hieu va cac ((xuc va) or (luc va)) doanh cua ((cua tre) OR (cua triet))*".