Perhaps you should try some spelling variations:
thuat sac » thuat sach, thuat san, thuat tac
thanh lap » phan lap, thanh hai, thanh van
duc tran » duc tan, duc toan, duc tren
hieu van » hieu va, thien van, lieu va
van cao » van dao, van bao, van hao
nang xa » lang xa, nang ma, mang xa
cao duc » dao duc, cao suc, giao duc
sac ky » cac ky, sai ky
cua cu » cua chu, cua cau, cua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sac ky ((nang xa) or (nang x)) hoi. hieu van cao duc tran ((thanh lap) OR (thanh san)) cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sac ky ((nang xa) OR (nang x)) hoi. hieu van cao duc tran ((thanh lap) OR (thanh san)) cua cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sac ky ((nang xa) or (nang x)) hoi. hieu van cao duc tran ((thanh lap) OR (thanh san)) cua cu".
• Adding a wildcard symbol may retrieve word variants: thuat sac ky ((nang xa) or (nang x)) hoi. hieu van cao duc tran ((thanh lap) OR (thanh san)) cua cu*.