Perhaps you should try some spelling variations:
thanh nhanh » thanh nhan, thanh thanh, thanh phan
nhung cong » dung cong, thong cong, hang cong
cong thanh » dong thanh, cong trinh, cong tan
tranh cua » doanh cua, manh cua
nhanh cau » nhanh cay, thanh chau, nhanh ha
hoc hieu » hoc thieu, hoc hien, hoc dieu
doc hieu » toc thieu, hoc thieu, hoc hien
luat » luan, xuat

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) OR (doc hieu)) manh - hanh ((trinh luat) or (tranh cua)) nhung cong thanh nhanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hieu) OR (doc hieu)) manh - hanh ((trinh luat) OR (tranh cua)) nhung cong thanh nhanh cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hieu) OR (doc hieu)) manh - hanh ((trinh luat) or (tranh cua)) nhung cong thanh nhanh cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc hieu) OR (doc hieu)) manh - hanh ((trinh luat) or (tranh cua)) nhung cong thanh nhanh cau*.