Perhaps you should try some spelling variations:
thieu sach » chieu sach, hieu cach, theo sach
thien hach » thien thanh, hien hanh
dung cong » dung trong
cong tinh » cong trinh, cong vinh, long tinh
anh mang » hanh mang, anh bang, anh dang
mang cua » manh cua, dung cua, ban cua
cua dung » cua dang, cua dong, qua dung
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 sach) or (thien hach)) - anh mang cua dung cong tinh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (thien hach)) - anh mang cua dung cong tinh toan ban*.