Perhaps you should try some spelling variations:
trinh luan » trinh luat, trinh quan, trinh han
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh cua » doanh cua, manh cua
hoc hieu » hoc thieu, hoc hien, doc hieu
tinh cua » trinh cua, sinh cua, tinh chat
tong tac » tuong tac, trong tac, cong tac
tac danh » sach danh, cac doanh, cac dan
danh ca » dan ca, doanh cua, danh cho

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu manh - hanh ((((tinh cua) or (tranh cua))) or (trinh luan)) han tong tac danh ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - hanh ((((tinh cua) OR (tranh cua))) OR (trinh luan)) han tong tac danh ca.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - hanh ((((tinh cua) or (tranh cua))) or (trinh luan)) han tong tac danh ca*.