Perhaps you should try some spelling variations:
trinh van » trinh han, trinh quan, trinh toan
hoc thuc » hoc huu
su sach » so sach, vu sach
coc tuc » coc luc, doc thuc, hoc truc
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ky hang » ky nang, ly hang, ky dang
co sach » bo sach, cuon sach, hoc sach
va hoi » xa hoi, va hoc, va hoa

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 (co sach)) ky hang va hoi. hieu ve ((coc tuc) or (hoc thuc)) lap trinh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) ky hang va hoi. hieu ve ((coc tuc) OR (hoc thuc)) lap trinh van cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) ky hang va hoi. hieu ve ((coc tuc) or (hoc thuc)) lap trinh van cua tre*.