Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
dang xay » dang van, van xay
cua tre » cua te, cuu tre, cua triet
cau cua » cau qua, ca cua, cu cua
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, lang van
hieu ke » hieu kem, chieu ke, hieu ky
ke cau » ket cau

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 ((lang xa) or (dang xay)) hoi. hieu ke cau cua ban hanh vai ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((lang xa) OR (dang xay)) hoi. hieu ke cau cua ban hanh vai ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((lang xa) or (dang xay)) hoi. hieu ke cau cua ban hanh vai ((cua tre) or (su triet))*.