Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
trinh vat » trinh luat, sinh vat, trinh han
trinh van » trinh han, trinh quan, trinh toan
san phan » san pham, van phan, dan phan
sat phan » sat nhan, vat phan, xuat phan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - canh ((trinh vat) OR (trinh van)) thong cong ((san phan) OR (sat phan)) dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - canh ((trinh vat) or (trinh van)) thong cong ((san phan) OR (sat phan)) dau~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - canh ((trinh vat) or (trinh van)) thong cong ((san phan) OR (sat phan)) dau*.