Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
trinh mat » trinh vat, trinh may, trinh mau
mat thong » suat thong, xuat thong, mang thong
hung manh » nhung manh, tung manh, duong manh
hung anh » hong anh, phuong anh, khuong anh
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi ((hieu lang) OR (chieu sang)) - hanh trinh mat thong ((hung manh) or (hung anh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi ((hieu lang) OR (chieu sang)) - hanh trinh mat thong ((hung manh) OR (hung anh)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi ((hieu lang) OR (chieu sang)) - hanh trinh mat thong ((hung manh) or (hung anh)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoi ((hieu lang) OR (chieu sang)) - hanh trinh mat thong ((hung manh) or (hung anh)) toan cao*.