Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
trung va » truong va, trang va, trung ha
ve cham » va cham, ve chat, vu cham
va hanh » van hanh, va thanh, va danh
su tien » su kien, su hien, tu tieng
ve cam » ve cac, va cam, ve cai
dai su » dai sua, dai so, dan su
x hoi » xa hoi, o hoi, x ho

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 2) or (sach y)) nang x hoi. hieu ((ve cam) or (ve cham)) trung va hanh dai su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach 2) OR (sach y)) nang x hoi. hieu ((ve cam) OR (ve cham)) trung va hanh dai su tien.
• Adding a wildcard symbol may retrieve word variants: su ((sach 2) or (sach y)) nang x hoi. hieu ((ve cam) or (ve cham)) trung va hanh dai su tien*.