Perhaps you should try some spelling variations:
thieu hach » thien hach, chieu sach, hieu cach
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
ban quan » van quan
cong san » cong tac
toan cau » toan cao, toan tap, toan tai
toan ban » van 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 hach - lanh ((ban cua) or (ban quan)) nhung cong san ((toan cau) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu hach - lanh ((ban cua) OR (ban quan)) nhung cong san ((toan cau) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu hach - lanh ((ban cua) or (ban quan)) nhung cong san ((toan cau) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu hach - lanh ((ban cua) or (ban quan)) nhung cong san ((toan cau) OR (toan ban))*.