Perhaps you should try some spelling variations:
truc may » tren may, truc va
cua viet » ca viet, hoa viet, cua vat
so sanh » do sanh
sanh vu » anh vu, hanh vu, sanh va
vu nang » vuc nang, va nang, vu dang
cao hoi » cau hoi, co hoi, cao hoc
ve cham » va cham, ve chat, vu cham
tinh vi » trinh vi, tinh voi, tinh va
ve cam » ve cac, va cam, ve cai
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh vu nang cao hoi. hieu ((ve cam) or (ve cham)) truc may tinh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh vu nang cao hoi. hieu ((ve cam) OR (ve cham)) truc may tinh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: so sanh vu nang cao hoi. hieu ((ve cam) or (ve cham)) truc may tinh vi cua viet*.