Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
van cam » van nam, van lam, van cau
ky dang » ky nang, ky danh
cuu tre » cua tre, cau tren, cau treo
ky anh » ky danh, ly anh, ty anh
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
vi cuu » vi luu, vinh cuu

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 ((ky dang) or (ky anh)) xa hoi. hieu van cam ((luc va) or (tuc va)) hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky dang) OR (ky anh)) xa hoi. hieu van cam ((luc va) OR (tuc va)) hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky dang) or (ky anh)) xa hoi. hieu van cam ((luc va) or (tuc va)) hanh vi cuu tre*.