Perhaps you should try some spelling variations:
vai triet » va triet, va trien, ve triet
hieu viec » nhieu viec, hieu ve, sieu viet
hieu vien » hieu hien, thieu nien, hieu tieng
doanh va » doan va, doanh tai, doanh cua
va doanh » van doanh, vay doanh, va danh
cac bao » cach bao, cac bai, cac ban
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, su sach, vu khach
bao va » bao ve, tao va, ban va
va vai » va bai, va van, va dai

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) or (vu sach)) ky nang xa hoi. ((hieu vien) OR (hieu viec)) cac bao va doanh va vai triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu sach)) ky nang xa hoi. ((hieu vien) OR (hieu viec)) cac bao va doanh va vai triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (vu sach)) ky nang xa hoi. ((hieu vien) OR (hieu viec)) cac bao va doanh va vai triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu sach)) ky nang xa hoi. ((hieu vien) OR (hieu viec)) cac bao va doanh va vai triet*.