Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hien sang » hien trang, khien bang, chieu sang
trinh cua » tinh cua, trinh luat, trinh quan
tong dan » tuong dan, thong dan, trong dan
than tap » toan tap, han tap, than cap
phan tap » phan lap, han tap, pha tap
cua han » cua hang, cua nhan, cua phan

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 sang - hanh trinh cua han tong dan ((than tap) or (phan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sang - hanh trinh cua han tong dan ((than tap) OR (phan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc hien sang - hanh trinh cua han tong dan ((than tap) or (phan tap))*.