Perhaps you should try some spelling variations:
thuat sac » thuat sach, thuat san, thuat tac
hieu van » hieu va, thien van, lieu va
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
van dang » van dong, van dung, van nang
thai cua » than cua, tai cuc, tri cua
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
va nang » van nang, da nang, cam nang
sac ky » cac ky, sai ky
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: thuat sac ky nang xa hoi. hieu van cac nuoc ((va nang) or (van dang)) thai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sac ky nang xa hoi. hieu van cac nuoc ((va nang) OR (van dang)) thai cua tu.
• Adding a wildcard symbol may retrieve word variants: thuat sac ky nang xa hoi. hieu van cac nuoc ((va nang) or (van dang)) thai cua tu*.