Perhaps you should try some spelling variations:
thanh vi » thanh va, thanh ve, nhanh vi
su triet » su viet, su tien, ve triet
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
chat tu » nhat tu, chai tu, chay tu
y nang » ky nang, ly nang, v nang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang xa hoi. hieu va chat tu va ((thanh vi) OR (hanh vi)) ((su triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu va chat tu va ((thanh vi) OR (hanh vi)) ((su triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. hieu va chat tu va ((thanh vi) OR (hanh vi)) ((su triet) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu va chat tu va ((thanh vi) OR (hanh vi)) ((su triet) or (va triet))*.