Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
trung tuan » trung thanh, trung tam, tran tuan
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
tran van » luan van
cong san » cong tac
toan tap » toan 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 sach - thanh ((trung tuan) or (tran van)) nhung cong san ((toan tap) or (van ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - thanh ((trung tuan) OR (tran van)) nhung cong san ((toan tap) OR (van ban)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - thanh ((trung tuan) or (tran van)) nhung cong san ((toan tap) or (van ban))*.