Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
sach va » sach xa, sach ha, sach dao
hanh di » hanh vi, hanh de, hang di
vuc van » duc van, luc van, thuc van
cac vuc » cac nuoc, cac vung, cac cuoc
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac
sach 2 » sach y
di cua » dai cua, doi cua, de cua
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: tu ((sach va) or (sach 2)) nang ma hoi. hieu ve cac vuc van hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach va) OR (sach 2)) nang ma hoi. hieu ve cac vuc van hanh di cua te*.