Perhaps you should try some spelling variations:
phuong tinh » phuong trinh, khuong tinh, phuong linh
phuong binh » phuong trinh, phuong anh, chuong trinh
hieu lang » chieu sang, hieu quang, nhieu tang
trang cua » tranh cua, trung cua, thang cua
doi hieu » doi chieu, doc hieu, doi hien
tang cua » mang cua, hang cua, tang luan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - hanh ((trang cua) or (tang cua)) nhung ((phuong tinh) OR (phuong binh)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - hanh ((trang cua) OR (tang cua)) nhung ((phuong tinh) OR (phuong binh)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi hieu lang - hanh ((trang cua) or (tang cua)) nhung ((phuong tinh) OR (phuong binh)) toan ban".
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - hanh ((trang cua) or (tang cua)) nhung ((phuong tinh) OR (phuong binh)) toan ban*.