Perhaps you should try some spelling variations:
cao toc » cac toc, cao hoc, cao thuoc
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
dang ha » dong ha, dung ha, lang ha
hieu va » lieu va, hieu qua
sach ky » sach y, sach ty, sach kem
cao loc » cao hoc, cao oc, chon loc
vi cua » vai cua, di cua
ha hoi » hoa hoi, ha noi, xa hoi
sac ky » cac ky, sai ky
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach ky) or (sac ky)) dang ha hoi. hieu va ((cao loc) OR (cao toc)) va tinh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ky) OR (sac ky)) dang ha hoi. hieu va ((cao loc) OR (cao toc)) va tinh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach ky) or (sac ky)) dang ha hoi. hieu va ((cao loc) OR (cao toc)) va tinh vi cua te".
• Adding a wildcard symbol may retrieve word variants: so ((sach ky) or (sac ky)) dang ha hoi. hieu va ((cao loc) OR (cao toc)) va tinh vi cua te*.