Perhaps you should try some spelling variations:
te sach » toc sach
cac tuc » cac toc, cac tu, cac tac
ky sang » ky dang, ky tang, duy sang
vai cua » dai cua, hai cua, lai cua
dau vai » dau va, dau hai, dau tai
hieu ve » hieu van
hieu va » lieu va, hieu qua
va dau » va dao
cua te » cua tu
tuc va » thuc va, truc va, tuc xa
ma hoi » mai hoi, xa hoi, ma hoa

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 sang) OR (ky nang)) ma hoi. ((hieu ve) or (hieu va)) cac tuc va dau vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky sang) OR (ky nang)) ma hoi. ((hieu ve) OR (hieu va)) cac tuc va dau vai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky sang) OR (ky nang)) ma hoi. ((hieu ve) or (hieu va)) cac tuc va dau vai cua te*".