Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
trinh toan » tinh toan, thanh toan, trinh quan
hoc thieu » toc thieu, hoc hien
trinh han » trinh quan
hang cong » dang cong, hang nong, bang cong
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan
phan dau » phan tu, hang dau

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