Perhaps you should try some spelling variations:
hieu luan » hieu luat, hieu quan, tieu luan
luan hoan » luan van
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
duc van » duc tan, duc manh, duc phan
hanh ve » hanh vi, hanh va, hanh kem
su viet » so viet
ve su » va su

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

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