Perhaps you should try some spelling variations:
thanh vien » nhan vien, thanh van
thanh va » thanh van, hanh va, thanh ha
hieu van » thien van, lieu va, hieu ve
te sach » toc sach
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
hang ca » hang va, nang cao, hang tai
ty hang » ly hang, ty xang, thi hang
xuc va » duc va, tuc va, luc va
ca hoi » cau hoi, cua hoi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty hang ca hoi. ((hieu van) OR (hieu va)) cam xuc va ((thanh vien) or (thanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty hang ca hoi. ((hieu van) OR (hieu va)) cam xuc va ((thanh vien) OR (thanh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty hang ca hoi. ((hieu van) OR (hieu va)) cam xuc va ((thanh vien) or (thanh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ty hang ca hoi. ((hieu van) OR (hieu va)) cam xuc va ((thanh vien) or (thanh va)) cua tre*.