Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
luong tin » thong tin, luong thi
luong tai » dung tai, luong va
trinh va » trinh van, trinh vat, trinh ve
trang va » tran van, hang va
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 - canh ((trinh va) or (trang va)) nhung ((luong tin) OR (luong tai)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - canh ((trinh va) OR (trang va)) nhung ((luong tin) OR (luong tai)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - canh ((trinh va) or (trang va)) nhung ((luong tin) OR (luong tai)) toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - canh ((trinh va) or (trang va)) nhung ((luong tin) OR (luong tai)) toan tap*.