Perhaps you should try some spelling variations:
thanh ket » thanh ke, hanh kem, thanh dat
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van, van xay
va trien » va truyen, va tuyen, va tieng
va thanh » gia thanh, ban thanh, va tinh
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
cam tuc » cam xuc, cam tu, nam thuc
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
thiet » thieu

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