Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
trung tuan » trung thanh, trung tam, tran tuan
trong tinh » truong tinh, trong kinh, trong sinh
hieu manh » chieu xanh, hieu nganh, dieu hanh
tuan dung » tuan duong, tran dung, tan dung
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((((hieu manh) or (chinh sach))) or (chieu sang)) - thanh trung tuan dung trong tinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((hieu manh) OR (chinh sach))) OR (chieu sang)) - thanh trung tuan dung trong tinh toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((((hieu manh) or (chinh sach))) or (chieu sang)) - thanh trung tuan dung trong tinh toan cau*.