Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cuu tre » cau tren, cau treo
hanh va » hang va, hanh vi
xa hanh » xa thanh, xa khanh, va hanh
cam tuc » cam xuc, cam tu, nam thuc
van cam » van nam, van lam, van cau
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
mai hoi » mai khoi, dai hoi, lai hoi
ky tang » ky nang, ky dang, kho tang
cua tre » cua te, cua triet, dua tren
ma hoi » xa hoi, ma hoa, me hoi

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