Perhaps you should try some spelling variations:
trinh van » trinh han, trinh quan, trinh toan
quy trinh » qua trinh, quy dinh
cua viet » ca viet, hoa viet, cua vat
thu sach » tu sach, thuat sach, thuoc sach
nam thuc » nam thuoc, am thuc, nam thu
van cua » vang cua, ban cua, dan cua
su sach » so sach, vu sach
hieu he » hieu ve, hiem he, hieu le
ty nang » ky nang, ty xang, ty hang
nam tu » nam thu
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (thu sach)) ty nang o hoi. hieu he ((nam tu) OR (nam thuc)) quy trinh van cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thu sach)) ty nang o hoi. hieu he ((nam tu) OR (nam thuc)) quy trinh van cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thu sach)) ty nang o hoi. hieu he ((nam tu) OR (nam thuc)) quy trinh van cua viet*".