Perhaps you should try some spelling variations:
thanh vaen » thanh van, thanh vien, thanh san
hieu vien » hieu hien, hieu viec, thieu nien
thanh va » thanh van, hanh va, thanh ha
vien cac » vien bach, vien dai, vien da
cuu tre » cua tre, cau tren, cau treo
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
cac luc » cau luc, coc luc, cac nuoc
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
luc va » duc va, tuc va, loc va

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 ty nang xa hoi. hieu vien cac luc va ((thanh va) or (thanh vaen)) ((cuu tre) or (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. hieu vien cac luc va ((thanh va) OR (thanh vaen)) ((cuu tre) OR (hoa viet)).
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. hieu vien cac luc va ((thanh va) or (thanh vaen)) ((cuu tre) or (hoa viet))*.