Perhaps you should try some spelling variations:
hoc thiet » hoc thieu, hoc thuyet, hoc hien
thiet anh » thien anh, thuyet anh, thien danh
tranh cua » doanh cua, manh cua
cua dung » cua dang, cua dong, qua dung
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
phan dau » phan tu, hang dau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thiet anh - canh tranh cua dung ((cong tan) OR (cong san)) phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet anh - canh tranh cua dung ((cong tan) OR (cong san)) phan dau".
• Adding a wildcard symbol may retrieve word variants: hoc thiet anh - canh tranh cua dung ((cong tan) OR (cong san)) phan dau*.