Perhaps you should try some spelling variations:
thuat sac » thuat sach, thuat san, thuat tac
hac nuoc » hoc nuoc, cac nuoc, phap nuoc
thai cua » than cua, tai cuc, tri cua
khai cua » hai cua, khi cua, khan cua
van nang » van quang, van ban, van dong
hieu van » hieu va, thien van, lieu va
nuoc van » nuoc va, nuoc san, luoc van
van hac » van hoc, van ha, van hai
nang xa » lang xa, nang ma, mang xa
sac ky » cac ky, sai ky

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 hac nuoc van nang ((khai cua) OR (thai cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sac ky ((nang xa) OR (nang x)) hoi. hieu van hac nuoc van nang ((khai cua) OR (thai cua)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sac ky ((nang xa) or (nang x)) hoi. hieu van hac nuoc van nang ((khai cua) OR (thai cua)) tu".
• Adding a wildcard symbol may retrieve word variants: thuat sac ky ((nang xa) or (nang x)) hoi. hieu van hac nuoc van nang ((khai cua) OR (thai cua)) tu*.