Perhaps you should try some spelling variations:
sieu viet » su viet, dien viet, bien viet
cau treo » cau theo, cau tren, cau triet
viet cac » vien cac, viet ca, viet bac
danh vai » danh sai, danh va, doanh van
cuu tre » cua tre, cau tren
tu sach » thu sach, su sach, te sach
cao van » cac van, dao van, cao dang
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
co van » vo van, so van, do van

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang xa hoi. sieu viet cac ((co van) OR (cao van)) danh vai ((cuu tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. sieu viet cac ((co van) OR (cao van)) danh vai ((cuu tre) OR (cau treo))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. sieu viet cac ((co van) OR (cao van)) danh vai ((cuu tre) or (cau treo))*".