Perhaps you should try some spelling variations:
thong dung » thong cong, thong thuong
thong tung » thong trung, thong cung, thong vung
hieu lang » chieu sang, hieu quang, nhieu tang
chinh vat » chinh va, chinh dat, chinh viet
manh toan » thanh toan, anh tuan, tinh toan
hoi hieu » hoi phieu, hoi tieu, moi hieu
toan cau » 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 - hanh chinh vat ((thong tung) OR (thong dung)) manh toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi hieu lang - hanh chinh vat ((thong tung) OR (thong dung)) manh toan cau".
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - hanh chinh vat ((thong tung) OR (thong dung)) manh toan cau*.