Perhaps you should try some spelling variations:
van quang » van quan, van tuan, ban quan
dao hanh » dao thanh, dang hanh, ban hanh
chuc dao » chuan dao, chuc danh, chuc giao
su sach » so sach, vu sach
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de cua
cua te » cua tu
va cam » va cham, va cac, va cao
ve cac » va cac, vien cac

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 quang) OR (tran quang)) xa hoi. hieu ((ve cac) or (va cam)) chuc dao hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((van quang) OR (tran quang)) xa hoi. hieu ((ve cac) OR (va cam)) chuc dao hanh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((van quang) OR (tran quang)) xa hoi. hieu ((ve cac) or (va cam)) chuc dao hanh di cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ((van quang) OR (tran quang)) xa hoi. hieu ((ve cac) or (va cam)) chuc dao hanh di cua te*.