Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
phuong tinh » phuong trinh, phuong binh, khuong tinh
theo chieu » theo tieu, theo chu, thi chieu
trinh van » trinh han, trinh quan, trinh toan
ho chieu » hoc thieu, doi chieu, mot chieu
toan ban » van ban
tinh va » tich va, trinh vat, tinh gia

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

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