Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
thi nang » thi cong, ki nang, thi hanh
thuc dan » thuc hanh, hoc dan, thuc vat
nam thuc » nam thuoc, am thuc, nam thu
nang nam » dang nam, hang nam, nang lam
ly nang » ky nang, ly hang, ly vang
hanh di » hanh de, hang di, danh di
tu sach » thu sach, su sach, te sach
y nang » ky nang, v nang, may nang

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)) xa hoi. thi nang nam thuc dan ((hanh di) OR (hanh vi)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ly nang)) xa hoi. thi nang nam thuc dan ((hanh di) OR (hanh vi)) va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) or (ly nang)) xa hoi. thi nang nam thuc dan ((hanh di) OR (hanh vi)) va triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (ly nang)) xa hoi. thi nang nam thuc dan ((hanh di) OR (hanh vi)) va triet*.