Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
hieu van » thien van, lieu va, hieu ve
nam thuc » nam thuoc, am thuc, nam thu
thanh ve » hanh ve, thanh va, thanh vien
tu sach » thu sach, su sach, te sach
co sach » bo sach, cuon sach, hoc sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
ve cuu » ve cau, ve chu, ve 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 (co sach)) ky nang xa hoi. ((hieu van) or (hieu va)) nam thuc vat thanh ve cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (co sach)) ky nang xa hoi. ((hieu van) OR (hieu va)) nam thuc vat thanh ve cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (co sach)) ky nang xa hoi. ((hieu van) or (hieu va)) nam thuc vat thanh ve cuu tre*.