Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
nhat moi » nha moi, nhat mpsi, nhap mon
tu sach » thu sach, su sach, te sach
tai cuu » tai cuc, tai buu, tai cua
luc van » luoc van, luu van, duc van
hai moi » hai muoi, dai moi
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
cuu tre » cua tre, cau tren, cau treo
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky lang ((hai moi) or (nhat moi)). hieu ((ve cam) or (va cac)) luc van hanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang ((hai moi) OR (nhat moi)). hieu ((ve cam) OR (va cac)) luc van hanh tai cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang ((hai moi) or (nhat moi)). hieu ((ve cam) or (va cac)) luc van hanh tai cuu tre*.