Perhaps you should try some spelling variations:
trinh han » trinh quan
trinh van » trinh quan, trinh toan, dinh van
thi hanh » thi thanh
tu sach » thu sach, su sach, te sach
su viet » so viet
hieu le » hieu ve, hieu he, hieu ly
nam tu » nam thu, nam thuc
tu qua » tu quan, tu cua, tu quy
le nam » ly nam, he nam, le na
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 ((ky nang) or (thi hanh)) x hoi. hieu le nam tu qua ((trinh van) or (trinh han)) su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky nang) OR (thi hanh)) x hoi. hieu le nam tu qua ((trinh van) OR (trinh han)) su viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky nang) or (thi hanh)) x hoi. hieu le nam tu qua ((trinh van) or (trinh han)) su viet*.