Perhaps you should try some spelling variations:
thanh trung » thanh tung
thue sach » thu sach, thuat sach, thuoc sach
trung tac » trung tam, trong tac, trung tai
trong bai » trong ban, thong bai, trong hai
cho thue » choi thuc, cuc thue, cho he
tac dung » sach dung, xay dung, tin dung
bai toan » bai tap
toan cau » toan cao, toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: cho thue sach - thanh trung tac dung trong bai toan cau~.
• Adding a wildcard symbol may retrieve word variants: cho thue sach - thanh trung tac dung trong bai toan cau*.