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