Perhaps you should try some spelling variations:
thanh trung » thanh tung
thien hach » thien thanh, hien hanh
trung tuan » trung thanh, trung tam, tran tuan
theo sach » thuoc sach, te sach, theo lich
dang cong » dung cong
bang song » nang song
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((theo sach) or (thien hach)) - thanh trung tuan ((dang cong) or (bang song)) dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((theo sach) OR (thien hach)) - thanh trung tuan ((dang cong) OR (bang song)) dan chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((theo sach) or (thien hach)) - thanh trung tuan ((dang cong) or (bang song)) dan chan cau*.