Perhaps you should try some spelling variations:
chet duoc » che duoc, cho duoc, chi duoc
hieu van » hieu va, thien van, lieu va
che quoc » che duoc, he quoc, che thuoc
van hanh » van thanh, ban hanh, van anh
thu sai » thu hai, thu tai, thu san
nang xa » nang x, lang xa, nang ma
vai cua » hai cua, lai cua, bai cua
sai ky » sac ky

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sai ky nang xa hoi. hieu van ((chet duoc) OR (che quoc)) van hanh ((vai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sai ky nang xa hoi. hieu van ((chet duoc) OR (che quoc)) van hanh ((vai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sai ky nang xa hoi. hieu van ((chet duoc) OR (che quoc)) van hanh ((vai cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sai ky nang xa hoi. hieu van ((chet duoc) OR (che quoc)) van hanh ((vai cua) or (dai cua)) tre*.