Perhaps you should try some spelling variations:
thong nhung » trong nhung, thong thuong, thong thong
thong hung » thong huong, thuong hung, thong dung
hanh trinh » canh tranh, hanh chinh
hieu lang » chieu sang, hieu quang, nhieu tang
trinh vat » trinh van, trinh luat, sinh vat
hoi hieu » hoi phieu, hoi tieu, moi hieu
toan cau » toan cao, toan tap, toan tai
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 hung) or (thong nhung)) manh ((toan cau) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi hieu lang - hanh trinh vat ((thong hung) OR (thong nhung)) manh ((toan cau) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi hieu lang - hanh trinh vat ((thong hung) or (thong nhung)) manh ((toan cau) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - hanh trinh vat ((thong hung) or (thong nhung)) manh ((toan cau) OR (toan ban))*.