Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu tu » chieu tu, hieu tuc, hien tu
tu nhan » tue nhan, cu nhan, tu ngan
luc van » luoc van, luu van, luc va
duc van » duc va, duc tan, duc manh
y nang » ky nang, ly nang, v nang
vi su » va su, ve su, ki su

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 xa hoi. hieu tu nhan ((luc van) OR (duc van)) hanh vi su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu tu nhan ((luc van) OR (duc van)) hanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu tu nhan ((luc van) OR (duc van)) hanh vi su triet*.