Perhaps you should try some spelling variations:
nhung huong » nhung phuong, nhung tuong, nhung cong
hieu quang » thieu quang, hieu quan, hieu qua
trinh cua » trinh luat, trinh quan, trinh luan
hoc hieu » hoc thieu, hoc hien, doc hieu
tinh cua » sinh cua, tinh chat, tranh cua
chan ban » chat ban, chan nan, chan doan
can ban » van ban, toan ban

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 quang - hanh ((trinh cua) OR (tinh cua)) nhung huong dan ((chan ban) or (can ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu quang - hanh ((trinh cua) OR (tinh cua)) nhung huong dan ((chan ban) OR (can ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu quang - hanh ((trinh cua) OR (tinh cua)) nhung huong dan ((chan ban) or (can ban))".
• Adding a wildcard symbol may retrieve word variants: hoc hieu quang - hanh ((trinh cua) OR (tinh cua)) nhung huong dan ((chan ban) or (can ban))*.