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