Perhaps you should try some spelling variations:
chet duoc » che duoc, cho duoc, che quoc
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
duoc van » duoc va, duc van, duoc ban
van chet » van chat, van chuyet, van chien
tai cua » thai cua, tai cuc, tri cua
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cua tu » cua tuc, cua su, cua cu

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 ((nang xa) or (lang xa)) hoi. hieu van chet duoc van hanh tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky ((nang xa) OR (lang xa)) hoi. hieu van chet duoc van hanh tai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ky ((nang xa) or (lang xa)) hoi. hieu van chet duoc van hanh tai cua tu".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ky ((nang xa) or (lang xa)) hoi. hieu van chet duoc van hanh tai cua tu*.