Perhaps you should try some spelling variations:
thanh ket » hanh kem, thanh dat, tinh ket
va trien » va truyen, va thiet, va tuyen
thanh ke » thanh ve, thanh de, thanh ky
dang xay » dang van, van xay
te sach » toc sach
sach ky » sac ky, sach y, sach ty
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
tuc va » thuc va, truc va, 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 dang xay hoi. lieu va cac ((tuc va) OR (tuc xa)) ((thanh ket) or (thanh ke)) va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang xay hoi. lieu va cac ((tuc va) OR (tuc xa)) ((thanh ket) OR (thanh ke)) va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang xay hoi. lieu va cac ((tuc va) OR (tuc xa)) ((thanh ket) or (thanh ke)) va trien".
• Adding a wildcard symbol may retrieve word variants: te sach ky dang xay hoi. lieu va cac ((tuc va) OR (tuc xa)) ((thanh ket) or (thanh ke)) va trien*.