Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thanh trung » thanh tung
trung thanh » truong thanh
thanh trong » tranh trong, hanh trong, nhanh trong
hien sach » dien sach, kien sach, thien hach
cong van » cong vang, cong san, song van
than cap » thanh lap, thanh cac, than cua
khan cap » khan ap, khoan cam, phan cac

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 thanh)) - thanh trung thanh trong cong van ((than cap) OR (khan cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (thien thanh)) - thanh trung thanh trong cong van ((than cap) OR (khan cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sach) or (thien thanh)) - thanh trung thanh trong cong van ((than cap) OR (khan cap))".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) or (thien thanh)) - thanh trung thanh trong cong van ((than cap) OR (khan cap))*.