Perhaps you should try some spelling variations:
dung duong » dung dong, dong duong, dung dung
hanh trinh » canh tranh, hanh chinh
duong manh » duong van
hieu lang » chieu sang, hieu quang, nhieu tang
trinh vat » trinh van, trinh luat, sinh vat
hoi hieu » hoi phieu, hoi tieu, moi hieu
vat dung » van dung, va dung, viet dung
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 dung duong manh ((toan tap) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi hieu lang - hanh trinh vat dung duong manh ((toan tap) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - hanh trinh vat dung duong manh ((toan tap) or (toan ban))*.