Perhaps you should try some spelling variations:
van nang » van quang, van ban, van dong
hanh dai » hanh tai, hanh dao, vanh dai
dao hanh » dao thanh, dang hanh, ban hanh
sach van » sach han, sach va, bach van
vien cac » vien bach, vien dai, vien da
chuc dao » chuan dao, chuc danh, chuc giao
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
va cam » va cham, va cac, va cao
ve cac » va cac
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: su sach van nang xa hoi. hieu ((((ve cac) OR (vien cac))) or (va cam)) chuc dao hanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach van nang xa hoi. hieu ((((ve cac) OR (vien cac))) OR (va cam)) chuc dao hanh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach van nang xa hoi. hieu ((((ve cac) OR (vien cac))) or (va cam)) chuc dao hanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: su sach van nang xa hoi. hieu ((((ve cac) OR (vien cac))) or (va cam)) chuc dao hanh dai cua te*.