Perhaps you should try some spelling variations:
trinh van » trinh han, trinh quan, trinh toan
qua trinh » qua kinh
su triet » su viet, su tien, ve triet
thu sach » thuat sach, thuoc sach, thu hoach
nam thuc » nam thuoc, am thuc, nam thu
tu sach » su sach, te sach, tu cach
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
nam tu » nam thu
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) OR (thu sach)) ty nang x hoi. hieu ve ((nam tu) or (nam thuc)) qua trinh van su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty nang x hoi. hieu ve ((nam tu) OR (nam thuc)) qua trinh van su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ty nang x hoi. hieu ve ((nam tu) or (nam thuc)) qua trinh van su triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ty nang x hoi. hieu ve ((nam tu) or (nam thuc)) qua trinh van su triet*.