Perhaps you should try some spelling variations:
ve triet » va trien, su triet
nam thuc » nam thuoc, am thuc, nam thu
hanh lam » thanh lap, hanh kem, hanh va
thi hanh » thi thanh
hanh la » hanh va, hanh ma, hang la
tu sach » thu sach, su sach, tu cach
hieu ve » hieu va, hieu van
hanh xa » hanh va, hanh ma, hanh xu
te sach » toc sach
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) or (te sach)) thi hanh xa hoi. hieu ve nam thuc vat ((hanh la) OR (hanh lam)) ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) thi hanh xa hoi. hieu ve nam thuc vat ((hanh la) OR (hanh lam)) ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) thi hanh xa hoi. hieu ve nam thuc vat ((hanh la) OR (hanh lam)) ve triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) thi hanh xa hoi. hieu ve nam thuc vat ((hanh la) OR (hanh lam)) ve triet*.