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
cong hach » cong sach, cong thanh, cong khanh
hach toan » thanh toan, manh toan
trung va » truong va, trang va, trung ha
toan cao » toan ban, toan tap
luan » quan, lan

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 - thanh ((trung va) or (((tran van) or (luan van)))) nhung cong hach toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - thanh ((trung va) OR (((tran van) OR (luan van)))) nhung cong hach toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - thanh ((trung va) or (((tran van) or (luan van)))) nhung cong hach toan cao*.