Perhaps you should try some spelling variations:
phuong tran » huong tran, phuong trinh, phuong thao
trung tuan » trung thanh, trung tam, tran tuan
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung cap, dung cua
thong tan » thong than, thong tran, thong tin
hoc hieu » hoc thieu, hoc hien, doc hieu
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 lang - hanh ((trung cua) OR (trung tuan)) thong ((thong tan) or (phuong tran)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh ((trung cua) OR (trung tuan)) thong ((thong tan) OR (phuong tran)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - hanh ((trung cua) OR (trung tuan)) thong ((thong tan) or (phuong tran)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh ((trung cua) OR (trung tuan)) thong ((thong tan) or (phuong tran)) toan cau*.