Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, theo sach
thanh dung » thanh duong, thanh tung, thanh hung
hang huong » hang thuong, hang luong, hoang phuong
hieu cach » hieu cac, chieu sach, hieu ca
luan hang » luan nang, luan han, luan hung
huong ban » huong dan, huong ben, huong lan
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 (hieu cach)) - thanh dung luan hang huong ban ((phan tu) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hieu cach)) - thanh dung luan hang huong ban ((phan tu) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (hieu cach)) - thanh dung luan hang huong ban ((phan tu) or (toan ban))*.