Perhaps you should try some spelling variations:
trung thanh » truong thanh
thanh trung » thanh tung
thanh trong » tranh trong, hanh trong, nhanh trong
thien hach » thien thanh, hien hanh
hien sach » dien sach, kien sach, chieu sach
cong van » cong vang, cong san, song van
than cau » toan cau, than cap, thanh chau
phan cau » phan dau, phan cac, phan tu

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