Perhaps you should try some spelling variations:
thuat sac » thuat sach, thuat san, thuat tac
toan cau » toan cao, toan ban, toan tap
hang tai » hang va, dung tai
nang xa » nang x, lang xa, nang ma
van dau » van dao, phan dau
va hang » van hang, va nang, va lang
cua tre » cuu tre, cua triet, dua tren
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
cua te » cua tu

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 hoi. hieu ((toan cau) or (van dau)) luc va hang tai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sac ky nang xa hoi. hieu ((toan cau) OR (van dau)) luc va hang tai ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: thuat sac ky nang xa hoi. hieu ((toan cau) or (van dau)) luc va hang tai ((cua tre) or (cua te))*.