Perhaps you should try some spelling variations:
thanh ket » thanh ke, thanh dat, tinh ket
va trien » va truyen, va thiet, va tuyen
dang van » hoang van, hang va
toc sach » hoc sach, doc sach, thuoc sach
ky dang » ky nang, ky danh
van hoe » van hoa, van hoc, van hieu
cac tuc » cac toc, cac tu, cac tac
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: ((te sach) or (toc sach)) ky dang van hoe. lieu va cac tuc va ((thanh ket) OR (hanh kem)) va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky dang van hoe. lieu va cac tuc va ((thanh ket) OR (hanh kem)) va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ky dang van hoe. lieu va cac tuc va ((thanh ket) OR (hanh kem)) va trien".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky dang van hoe. lieu va cac tuc va ((thanh ket) OR (hanh kem)) va trien*.