Perhaps you should try some spelling variations:
nhanh hai » nhanh thai, thanh hai, nhanh ha
hanh hai » thanh hai, hang hai, hanh tai
hieu van » hieu va, thien van, lieu va
su sach » vu sach
van cau » van dau, van hau, van chat
truc va » thuc va, thuc vat, trung va
nang xa » nang x, lang xa, nang ma
so sach » so sanh, bo sach, co sach
cuu tre » cua tre, cau tren, cau treo

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (so sach)) ky nang xa hoi. hieu van cau truc va ((hanh hai) OR (nhanh hai)) cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ky nang xa hoi. hieu van cau truc va ((hanh hai) OR (nhanh hai)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ky nang xa hoi. hieu van cau truc va ((hanh hai) OR (nhanh hai)) cuu tre*.