Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
hieu van » hieu va, thien van, lieu va
su sach » vu sach
van cam » van nam, van lam, van cau
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua

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) or (so sach)) ky dang xa hoi. hieu van cam ((xuc va) OR (tuc va)) thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky dang xa hoi. hieu van cam ((xuc va) OR (tuc va)) thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ky dang xa hoi. hieu van cam ((xuc va) OR (tuc va)) thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky dang xa hoi. hieu van cam ((xuc va) OR (tuc va)) thanh vi cua tre*.