Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
thi chieu » thi chien, thi hieu, theo chieu
trung vap » trung va, trung van, trung lap
trung cap » truong cao, trung tam
dung cong » dung trong
cong tuan » cong tan, cong luan, cong thanh
tuan gian » tran gian, tran giang, thanh gian
gian cau » gian chau, gian cac, gian cam

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) or (thi chieu)) xanh - hanh ((trung vap) OR (trung cap)) dung cong tuan gian cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (thi chieu)) xanh - hanh ((trung vap) OR (trung cap)) dung cong tuan gian cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (thi chieu)) xanh - hanh ((trung vap) OR (trung cap)) dung cong tuan gian cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (thi chieu)) xanh - hanh ((trung vap) OR (trung cap)) dung cong tuan gian cau*.