Perhaps you should try some spelling variations:
tieng manh » tieng anh, tien manh, tieng han
hanh trinh » canh tranh
nhung cong » dung cong, thong cong, hang cong
hoc tieng » hoc hien
cong tinh » cong trinh, cong vinh, long tinh
toan cau » toan ban, toan tap, toan tai
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: hoc tieng manh - ((hanh trinh) or (hanh chinh)) va nhung cong tinh ((toan cau) OR (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tieng manh - ((hanh trinh) OR (hanh chinh)) va nhung cong tinh ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc tieng manh - ((hanh trinh) or (hanh chinh)) va nhung cong tinh ((toan cau) OR (toan cao))".
• Adding a wildcard symbol may retrieve word variants: hoc tieng manh - ((hanh trinh) or (hanh chinh)) va nhung cong tinh ((toan cau) OR (toan cao))*.