Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
xang dau » hang dau
hieu ve » hieu va, hieu van
tai cua » thai cua, tai cuc, tri cua
luc van » luoc van, luu van, duc van
cac luc » cau luc, coc luc, cac nuoc
sach ky » sac ky, sach kem, sach hay
dau hoi » cau hoi, dai hoi, dan hoi
sach ty » sach tu, sach thu, xach tay
ve cac » va cac, vien cac
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (((sach ty) OR (sach y)))) xang dau hoi. hieu ve cac luc van hanh tai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (((sach ty) OR (sach y)))) xang dau hoi. hieu ve cac luc van hanh tai cua te~".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (((sach ty) OR (sach y)))) xang dau hoi. hieu ve cac luc van hanh tai cua te*.