Perhaps you should try some spelling variations:
thanh lai » thanh hai, thanh lap, thanh loi
dua tren » dung tren
thu sach » thuat sach, thuoc sach, thu hoach
cong xay » thong xay, trong xay, cong ty
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
tu sach » su sach, te sach, tu cach
cam tuc » cam xuc, cam tu, nam thuc
van cam » van nam, van lam, van cau
xay hoi » xa hoi, tay hoi, cay phoi
tu cong » thu cong, te cong, tai cong
cuu tre » cua tre, cau tren, cau treo
tuc va » thuc va, truc va, tuc xa

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 (thu sach)) tu cong xay hoi. hieu van cam tuc va thanh lai ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) tu cong xay hoi. hieu van cam tuc va thanh lai ((dua tren) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) tu cong xay hoi. hieu van cam tuc va thanh lai ((dua tren) or (cuu tre))*.