Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
te sach » toc sach
vai cuu » vai cua
dau vai » dau va, dau hai, dau tai
truc va » thuc va, thuc vat, trung va
van cam » van nam, van lam, van cau
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
cuu tre » cua tre, cau tren, cau treo
tuc va » thuc va, tuc xa, duc va

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 ((ky lang) or (ky tang)) xa hoi. hieu van cam ((tuc va) OR (truc va)) dau vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky lang) OR (ky tang)) xa hoi. hieu van cam ((tuc va) OR (truc va)) dau vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky lang) or (ky tang)) xa hoi. hieu van cam ((tuc va) OR (truc va)) dau vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky lang) or (ky tang)) xa hoi. hieu van cam ((tuc va) OR (truc va)) dau vai cuu tre*.