Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hanh trung » thanh trung, hanh trang, manh trung
hien sach » dien sach, kien sach, chieu sach
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
cong dan » cong san, cong tan, cong dong
toan tap » toan ban

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