Perhaps you should try some spelling variations:
cac trung » cac truong, dac trung, bac trung
trung va » truong va, trang va, trung ha
thanh vi » thanh va, thanh ve, nhanh vi
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
su viet » so viet
ve cac » va cac, vien cac
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: vu sach ty nang x hoi. hieu ve cac trung va ((thanh vi) or (hanh vi)) su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang x hoi. hieu ve cac trung va ((thanh vi) OR (hanh vi)) su viet.
• Adding a wildcard symbol may retrieve word variants: vu sach ty nang x hoi. hieu ve cac trung va ((thanh vi) or (hanh vi)) su viet*.