Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
canh trinh » canh tranh, hanh trinh, canh tinh
hoc thieu » toc thieu, hoc hien
trinh vat » trinh van, trinh luat, sinh vat
vat thong » va thong, vat trong, mat thong
cong dan » cong san, cong tan, cong tac
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 thieu sach - canh trinh vat thong ((((cong dan) or (cong dong))) or (huong dan)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - canh trinh vat thong ((((cong dan) OR (cong dong))) OR (huong dan)) toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - canh trinh vat thong ((((cong dan) or (cong dong))) or (huong dan)) toan tap*.