Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
xa thanh » va thanh, ha thanh, ta thanh
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
nam tuc » nam thuc, nam truc, nam tu
xa hanh » xa khanh, da hanh, na hanh
va hanh » van hanh, va thanh, va danh
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang

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 xa hoi. hieu van nam tuc ((((xa hanh) OR (va hanh))) or (xa thanh)) vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu van nam tuc ((((xa hanh) OR (va hanh))) OR (xa thanh)) vai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu van nam tuc ((((xa hanh) OR (va hanh))) or (xa thanh)) vai cuu tre*".