Perhaps you should try some spelling variations:
vay doanh » van doanh, ly doanh, voi doanh
vien cac » vien bach, vien dai, vien da
doanh va » doan va, doanh tai, doanh cua
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
ve cac » va cac
tu vay » tu va, tu van, tu cay

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 ((ve cac) OR (vien cac)) tu vay doanh va su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. hieu ((ve cac) OR (vien cac)) tu vay doanh va su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu ((ve cac) OR (vien cac)) tu vay doanh va su triet*.