Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
doanh van » doan van, doanh va, doanh ban
thuc dan » thuc hanh, hoc dan, thuc vat
danh vai » danh sai, danh va, dang van
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
ly nang » ky nang, ly hang, ly vang
y nang » ky nang, v nang, may nang
co hoi » co hoc, co loi
va am » va lam, va cam

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) or (ly nang)) co hoi. hieu va am thuc dan ((danh vai) OR (doanh van)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ly nang)) co hoi. hieu va am thuc dan ((danh vai) OR (doanh van)) cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) or (ly nang)) co hoi. hieu va am thuc dan ((danh vai) OR (doanh van)) cua triet*".