Perhaps you should try some spelling variations:
hanh hang » thanh hang, hang hang, hanh han
lang cong » bang cong, hang cong, lang dong
dang cong » dung cong
chi sach » chinh sach, chieu sach, co sach
tac than » tac thanh, tam than, bac thanh
tac nhan » tao nhan, cac nhan, dac nhan
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi sach - hanh hang va ((lang cong) or (dang cong)) ((tac than) or (tac nhan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sach - hanh hang va ((lang cong) OR (dang cong)) ((tac than) OR (tac nhan)) cau.
• Adding a wildcard symbol may retrieve word variants: doi chi sach - hanh hang va ((lang cong) or (dang cong)) ((tac than) or (tac nhan)) cau*.