Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
hanh xu » hanh tu, hanh sua, hanh cua
canh xa » canh va, canh tac, canh tay
nam ha » nam a, nam va, nam khoa
nam da » nam dan, nam a, nam va
ve nam » he nam, va nam, le nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thieu ((canh xa) or (hanh xu)) hoi. hieu ve nam thuc va danh ((nam ha) OR (nam da)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thieu ((canh xa) OR (hanh xu)) hoi. hieu ve nam thuc va danh ((nam ha) OR (nam da)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thieu ((canh xa) or (hanh xu)) hoi. hieu ve nam thuc va danh ((nam ha) OR (nam da)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sach thieu ((canh xa) or (hanh xu)) hoi. hieu ve nam thuc va danh ((nam ha) OR (nam da)) triet*.