Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
danh sai » dung sai, danh bat, danh dau
danh vai » danh va, doanh van, dang van
viec cac » viec cua, viec lam, viec va
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cuu tre » cua tre, cau tren, cau treo
lo van » le van, vo van, so 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 ty nang xa hoi. hieu ((viec cac) OR (vien cac)) lo van ((danh vai) or (danh sai)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu ((viec cac) OR (vien cac)) lo van ((danh vai) OR (danh sai)) cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. hieu ((viec cac) OR (vien cac)) lo van ((danh vai) or (danh sai)) cuu tre*".