Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu lang » chieu sang, hieu quang, nhieu tang
vat thong » vat trong, mat thong, vat khong
hung manh » nhung manh, hung anh, tung manh
hoi hieu » hoi phieu, hoi tieu, moi hieu
va thong » va thuong, va phuong, he thong
toan cao » toan tap
toan ban » van ban

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