Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hieu nganh » vien nganh, hiem ngan, hieu manh
thong cong » trong cong, tong cong, thong thong
hanh hanh » hanh han, xanh hanh, nhanh thanh
thanh tap » thanh lap, thanh tai, thanh tam
thanh tay » thanh tai, thanh toan, thanh thuy
cong san » cong tac
hanh he » hanh che, hanh ve, hanh de

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu xanh) or (hieu nganh)) - hanh hanh he thong cong san ((thanh tap) OR (thanh tay))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (hieu nganh)) - hanh hanh he thong cong san ((thanh tap) OR (thanh tay)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (hieu nganh)) - hanh hanh he thong cong san ((thanh tap) OR (thanh tay))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (hieu nganh)) - hanh hanh he thong cong san ((thanh tap) OR (thanh tay))*.