Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hien tinh » khien tinh, thien tinh, bien tinh
trinh han » trinh quan
tinh vai » tinh va, tinh hai, tinh bai
cong dan » cong san, cong tan, huong dan
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 hien tinh - canh ((tinh vai) or (trinh han)) thong cong dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien tinh - canh ((tinh vai) OR (trinh han)) thong cong dan chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc hien tinh - canh ((tinh vai) or (trinh han)) thong cong dan chan cau*.