Perhaps you should try some spelling variations:
phuong dung » thong dung, cuong dung
trinh toan » tinh toan, thanh toan, trinh han
hieu lang » chieu sang, hieu quang, nhieu tang
trinh van » trinh han, trinh quan, dinh van
manh toan » thanh toan, anh tuan, tinh toan
nho hieu » nha hieu, nho sieu, nhu 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: nho hieu lang - hanh ((trinh van) OR (trinh toan)) ((phuong dung) or (phuong hoang)) manh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho hieu lang - hanh ((trinh van) OR (trinh toan)) ((phuong dung) OR (phuong hoang)) manh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nho hieu lang - hanh ((trinh van) OR (trinh toan)) ((phuong dung) or (phuong hoang)) manh toan cau".
• Adding a wildcard symbol may retrieve word variants: nho hieu lang - hanh ((trinh van) OR (trinh toan)) ((phuong dung) or (phuong hoang)) manh toan cau*.