Perhaps you should try some spelling variations:
trinh dai » trinh tai, trinh di, trinh da
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam
luc va » tuc va, loc va
cua te » cua tu
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: su sach y nang x hoi. hieu ve cam ((luc va) or (duc va)) trinh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x hoi. hieu ve cam ((luc va) OR (duc va)) trinh dai cua te.
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. hieu ve cam ((luc va) or (duc va)) trinh dai cua te*.