Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hanh trinh » canh tranh, hanh chinh
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
trinh vat » trinh van, trinh luat, sinh vat
vat thong » va thong, vat trong, mat thong
van tai » van tuan

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 - hanh trinh vat thong cong ((van tai) OR (von tai)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - hanh trinh vat thong cong ((van tai) OR (von tai)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh trinh vat thong cong ((van tai) OR (von tai)) cao*.