Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thanh ha » thanh hoa, thanh hai, nhanh ha
nang xay » dang xay, nganh xay, nang xuan
chat duc » chat xuc, chat doc, chet duoc
ve chat » va chat, van chat
hanh va » hang va, hanh vi
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ty nang » ky nang, ty xang, ty hang
luu tre » luu tru, cuu tre, luy tre

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)) ty nang xay hoi. hieu ve chat duc va ((thanh ha) or (hanh va)) luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty nang xay hoi. hieu ve chat duc va ((thanh ha) OR (hanh va)) luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ty nang xay hoi. hieu ve chat duc va ((thanh ha) or (hanh va)) luu tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ty nang xay hoi. hieu ve chat duc va ((thanh ha) or (hanh va)) luu tre*.