Perhaps you should try some spelling variations:
phan thanh » pham thanh, ban thanh, van thanh
va trien » va truyen, va thiet, va tuyen
ha thanh » va thanh, pham thanh, thi thanh
xa thanh » va thanh, ta thanh, gia thanh
dang xay » dang van, van xay
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
xay hoi » xa hoi, tay hoi, cay phoi
te sach » toc sach
va cam » va cham, va cac, va cao
y dang » ky dang, 2 dang, _ dang
ket va » ket van

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 y dang xay hoi. hieu va cam tuc ((xa thanh) or (((ha thanh) OR (phan thanh)))) ket va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y dang xay hoi. hieu va cam tuc ((xa thanh) OR (((ha thanh) OR (phan thanh)))) ket va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y dang xay hoi. hieu va cam tuc ((xa thanh) or (((ha thanh) OR (phan thanh)))) ket va trien".
• Adding a wildcard symbol may retrieve word variants: te sach y dang xay hoi. hieu va cam tuc ((xa thanh) or (((ha thanh) OR (phan thanh)))) ket va trien*.