Perhaps you should try some spelling variations:
nhung chong » nhung cong, nhung phong, nhung phuong
khien bang » phien ban, khien dong
hien sang » hien trang, chieu sang, thien bang
truong va » truong dai, truong cao, truong dao
chong van » thong van, hong van, phong van
trung va » trang va, trung ha, trung tam
ban ban » ban banh, can ban, ban dan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien sang) OR (khien bang)) - thanh ((trung va) or (truong va)) nhung chong van ban ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sang) OR (khien bang)) - thanh ((trung va) OR (truong va)) nhung chong van ban ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sang) OR (khien bang)) - thanh ((trung va) or (truong va)) nhung chong van ban ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sang) OR (khien bang)) - thanh ((trung va) or (truong va)) nhung chong van ban ban*.