Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
duoc duoc » duoc hoc, hoc duoc, soc duoc
trinh van » trinh han, trinh quan, trinh toan
cac trinh » cac tinh, lap trinh, cac thanh
lang van » dang van, tang van, hoang van
duoc cac » cuoc cach, duoc chat, duong cac
cua tre » cua te, cuu tre, dua tren
hieu ve » hieu va, hieu van
ve duoc » te duoc, ve nuoc, che duoc
lang xa » lang ha, dang xay
sac ky » cac ky, sai ky
su sac » su sach, su cac, su xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((lang xa) OR (lang van)) hoi. hieu ve duoc duoc cac trinh van ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((lang xa) OR (lang van)) hoi. hieu ve duoc duoc cac trinh van ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky ((lang xa) OR (lang van)) hoi. hieu ve duoc duoc cac trinh van ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sac ky ((lang xa) OR (lang van)) hoi. hieu ve duoc duoc cac trinh van ((cua tre) or (cua triet))*.