Perhaps you should try some spelling variations:
trong manh » trong minh, trong anh, trong mach
chau tinh » cuu tinh, ha tinh, cua tinh
manh toan » thanh toan, anh tuan, tinh toan
doi chau » doi chieu, gioi chau, hoi chu
tranh va » tranh van, trang va, trinh va
tran van » luan van
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: doi chau tinh - canh ((tranh va) or (tran van)) dung trong manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chau tinh - canh ((tranh va) OR (tran van)) dung trong manh toan cao*.