Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung tham » trung tam, trung thanh, trung thang
tham nhung » thi nhung
nhung cong » dung cong, thong cong, hang cong
quang phan » quang chan, quang phat, quang thanh
hien sach » dien sach, thien hach, chieu sach
kien sach » dien sach, vien bach, kien mac
vang phan » van phan, nang phan, va phan

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 sach) or (kien sach)) - thanh trung tham nhung cong ((vang phan) OR (quang phan)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (kien sach)) - thanh trung tham nhung cong ((vang phan) OR (quang phan)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sach) or (kien sach)) - thanh trung tham nhung cong ((vang phan) OR (quang phan)) tu".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) or (kien sach)) - thanh trung tham nhung cong ((vang phan) OR (quang phan)) tu*.