Perhaps you should try some spelling variations:
su triet » su viet, su tien
ve triet » va trien
va tinh » may tinh
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam
cam tu » cam thu, nam tu, dam tu
te sac » te sach, te cac, te san

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

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