Perhaps you should try some spelling variations:
tieu sach » chieu sach, dien sach, te sach
hanh mang » nhanh mang, hanh trang, nhanh lang
cong tac » cong ty
mang va » mang vua, hang va, bang va
va lang » va nang, hoa lang
than ma » than man, than va, nhan ma
khan ma » nhan ma, khan maaz, phan may

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sach - hanh mang va lang ((cong san) or (cong tac)) ((than ma) or (khan ma))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - hanh mang va lang ((cong san) OR (cong tac)) ((than ma) OR (khan ma)).
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - hanh mang va lang ((cong san) or (cong tac)) ((than ma) or (khan ma))*.