Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
tang luan » dung luan
van thanh » ban thanh, van tuan
tang cua » mang cua, hang cua, thong cua
van toan » van tuan, van tan, manh toan

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 - hanh ((tang cua) or (tang luan)) nhung cong ((van toan) OR (van thanh)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh ((tang cua) OR (tang luan)) nhung cong ((van toan) OR (van thanh)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - hanh ((tang cua) or (tang luan)) nhung cong ((van toan) OR (van thanh)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh ((tang cua) or (tang luan)) nhung cong ((van toan) OR (van thanh)) cao*.