Perhaps you should try some spelling variations:
trinh van » trinh han, trinh quan, trinh toan
su triet » su viet, su tien, ve triet
tu quynh » thu quynh, thuy quynh, truc quynh
hieu he » hieu ve, hiem he, hieu le
tu sach » thu sach, te sach, tu cach
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach
tu quy » tu duy
van su » dan su
he nam » ha nam, nghe nam
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) OR (su sach)) ty nang x hoi. hieu he 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) OR (su sach)) ty nang x hoi. hieu he nam ((tu quy) OR (tu quynh)) trinh van su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ty nang x hoi. hieu he nam ((tu quy) or (tu quynh)) trinh van su triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ty nang x hoi. hieu he nam ((tu quy) or (tu quynh)) trinh van su triet*.