Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
luong dan » luong van, tuong dan, xuong dan
luong dao » duong dao, truong dao, luong giao
cong lap » cong luan, cong lang, cong tac
phan cau » phan dau, phan cac, phan tu
lap van » lap va, tap van, lap 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 cong lap van ((((luong dan) OR (luong dao))) or (huong dan)) phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - thanh cong lap van ((((luong dan) OR (luong dao))) OR (huong dan)) phan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - thanh cong lap van ((((luong dan) OR (luong dao))) or (huong dan)) phan cau*".