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
tinh thai » sinh thai, tinh toan, tinh chat
tinh hai » tinh chat, trinh han, thanh hai
cong san » cong tac
san chan » san chang, dan chan, san chay
chan cau » phan cau, can cau, chinh cau
tinh va » tich va, trinh van, trinh vat

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