Perhaps you should try some spelling variations:
nam trung » nam trong, tai trung, ba trung
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
nam truc » nam truoc, nam thuc, nam thuoc
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
xa hanh » xa thanh, xa khanh, va hanh
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
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) OR (thu sach)) y nang xa hoi. hieu van ((nam truc) or (nam trung)) xa hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang xa hoi. hieu van ((nam truc) OR (nam trung)) xa hanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) y nang xa hoi. hieu van ((nam truc) or (nam trung)) xa hanh vi cua tre*".