Perhaps you should try some spelling variations:
kinh sach » sinh sach, dinh sach, tinh sach
trinh cua » tinh cua, trinh luat, trinh quan
hoc kinh » hoc sinh, luoc kinh
sinh cua » manh cua, dinh cuu, sinh va
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc kinh sach - hanh ((trinh cua) or (sinh cua)) cong ((cong dan) or (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc kinh sach - hanh ((trinh cua) OR (sinh cua)) cong ((cong dan) OR (cong san)) toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc kinh sach - hanh ((trinh cua) or (sinh cua)) cong ((cong dan) or (cong san)) toan cao*.