Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, chien tranh
thanh tung » thanh cong
hien hanh » dieu hanh
tung tam » trung tam, vung tam, dung tam
tong dan » tuong dan, thong dan, trong dan
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan tap
tam han » tam than, tam chan, tam hon

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien thanh) or (hien hanh)) - thanh tung tam han tong dan than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien thanh) OR (hien hanh)) - thanh tung tam han tong dan than tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((thien thanh) or (hien hanh)) - thanh tung tam han tong dan than tap*.