Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van chat » cao chat
cua tre » cua te, cuu tre, dua tren
dao dai » dat dai, dao dan, tao dai
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa
va dao » ca dao
va co » vo co

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: tu sach ty nang ma hoi. hieu ((van chat) OR (va co)) thuc va dao dai ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ma hoi. hieu ((van chat) or (va co)) thuc va dao dai ((cua tre) OR (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ma hoi. hieu ((van chat) or (va co)) thuc va dao dai ((cua tre) OR (cua triet))*.