Perhaps you should try some spelling variations:
trinh van » trinh han, trinh quan, trinh toan
tu quynh » thu quynh, thuy quynh, truc quynh
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
hieu le » hieu ve, hieu he, hieu ly
le nam » ly nam, he nam, le na
tu quy » tu duy
van su » dan su
x hoi » xa hoi, o hoi, x ho

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 tu nang x hoi. hieu le nam ((tu quy) or (tu quynh)) trinh van su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang x hoi. hieu le nam ((tu quy) OR (tu quynh)) trinh van su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang x hoi. hieu le nam ((tu quy) or (tu quynh)) trinh van su triet*.