Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
su triet » su viet, su tien, ve triet
va triet » va trien, ve triet, cua triet
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
cac xuc » cam xuc, cac nuoc, chat xuc
xuc va » duc va, tuc va, luc va
thiet » thieu

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 ty nang xa hoi. hieu van cac xuc va thanh san ((su triet) or (((va triet) OR (va thiet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu van cac xuc va thanh san ((su triet) OR (((va triet) OR (va thiet)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. hieu van cac xuc va thanh san ((su triet) or (((va triet) OR (va thiet))))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu van cac xuc va thanh san ((su triet) or (((va triet) OR (va thiet))))*.