Perhaps you should try some spelling variations:
thanh trung » thanh tung
theo chieu » theo tieu, ho chieu, theo chu
phuong bac » phuong cach, phuong tay, phuong mai
hoc thieu » toc thieu, hoc hien
bac than » bac thanh, bac thang, ban than
than cau » toan cau, phan cau, than cap
cap can » cap han, cap van, cap bang
tap can » tap van, tap cac, tac can

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) or (theo chieu)) sach - thanh trung ((cap can) OR (tap can)) phuong bac than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (theo chieu)) sach - thanh trung ((cap can) OR (tap can)) phuong bac than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (theo chieu)) sach - thanh trung ((cap can) OR (tap can)) phuong bac than cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (theo chieu)) sach - thanh trung ((cap can) OR (tap can)) phuong bac than cau*.