Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
tran tien » tran thien, toan tien, tran hien
dung cong » dung trong
trinh han » trinh quan
theo chu » theo chieu, cho chu, chao chu
tran tin » trang tin, toan tin, tran tan
han cao » han cho, han gao, hoang cao

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) OR (theo chu)) xanh - hanh ((tran tin) OR (tran tien)) dung cong trinh han cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (theo chu)) xanh - hanh ((tran tin) OR (tran tien)) dung cong trinh han cao~".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (theo chu)) xanh - hanh ((tran tin) OR (tran tien)) dung cong trinh han cao*.