Perhaps you should try some spelling variations:
trinh van » trinh han, trinh quan, trinh toan
van thiet » dan thiet, can thiet, van thien
ha trinh » kha trinh, ha tinh, va trinh
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
cac bac » cac bai, cac ban, cac cach
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, 5 hoi

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 y nang ((x hoi) or (x ho)). hieu ve cac bac ha trinh van ((van thiet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((x hoi) OR (x ho)). hieu ve cac bac ha trinh van ((van thiet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((x hoi) or (x ho)). hieu ve cac bac ha trinh van ((van thiet) or (va thiet))*.