Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
nam xuc » cam xuc, nam xua, nam duoc
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
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: tu sach y nang ma hoi. hieu van ((nam xuc) OR (nam thuc)) va danh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ma hoi. hieu van ((nam xuc) OR (nam thuc)) va danh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoi. hieu van ((nam xuc) OR (nam thuc)) va danh vi cua tre*.