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 » so sach, vu sach
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
van cam » van nam, van lam, van cau
dang ha » dong ha, dung ha, lang ha
xuc va » duc va, luc va, xac va
y dang » ky dang, 2 dang, _ dang
tuc va » thuc va, truc va, tuc xa
ha hoi » hoa hoi, ha noi, xa hoi

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