Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
su triet » su viet, su tien, ve triet
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
van chat » cao chat
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
luc va » duc va, tuc va, loc va
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, xac va

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 van chat ((xuc va) OR (luc va)) thanh dai ((cua viet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu van chat ((xuc va) OR (luc va)) thanh dai ((cua viet) OR (su triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. hieu van chat ((xuc va) OR (luc va)) thanh dai ((cua viet) or (su triet))*".