Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
pham thuc » phap thuc, pham chuc, nham thuc
doan dau » doan dieu, phan dau, doan va
cua tre » cua te, cuu tre, dua tren
va doan » va doanh, van doan, va dan
thuc va » thuc vat, thuc dan, thuc day
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
hieu vu » hieu ve, hieu su, dieu vu
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoi. ((hieu vu) OR (hieu va)) pham thuc va doan dau ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ma hoi. ((hieu vu) OR (hieu va)) pham thuc va doan dau ((cua tre) or (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ma hoi. ((hieu vu) OR (hieu va)) pham thuc va doan dau ((cua tre) or (cua triet))*.