Perhaps you should try some spelling variations:
thien danh » thien anh, thien dang, thien thanh
canh trinh » canh tranh, hanh trinh, canh tinh
thong dan » thong van, tuong dan, thong den
trinh ve » trinh he, trinh va, trinh vi
ve thong » he thong, va thong, ve phong
phan dau » phan tu
hang dau » hang va, hang tai

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 danh) or (trieu tinh)) - canh trinh ve thong thong dan ((phan dau) OR (hang dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien danh) OR (trieu tinh)) - canh trinh ve thong thong dan ((phan dau) OR (hang dau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien danh) or (trieu tinh)) - canh trinh ve thong thong dan ((phan dau) OR (hang dau))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien danh) or (trieu tinh)) - canh trinh ve thong thong dan ((phan dau) OR (hang dau))*.