Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
truong cua » truong ca, truong quan, truong cao
hien sach » dien sach, kien sach, chieu sach
trung cap » truong cao, trung tam
dung cong » dung trong
cong san » cong tac
san van » tan van, luan van, tran van

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 (thien hach)) - hanh ((trung cap) or (truong cua)) dung cong san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (thien hach)) - hanh ((trung cap) OR (truong cua)) dung cong san van ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sach) OR (thien hach)) - hanh ((trung cap) or (truong cua)) dung cong san van ban*".