Perhaps you should try some spelling variations:
thuat sac » thuat sach, thuat san, thuat tac
truoc va » truc va, thuoc va, truong va
voi khoa » noi khoa, hoi khoa, voi hoa
loi khoa » loai khoa, noi khoa, hoi khoa
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va hanh » van hanh, va thanh, va danh
va nam » van nam, va nay
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 lang xa hoi. hieu ((va nam) OR (ha nam)) truoc va hanh ((voi khoa) or (loi khoa)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sac ky lang xa hoi. hieu ((va nam) OR (ha nam)) truoc va hanh ((voi khoa) OR (loi khoa)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sac ky lang xa hoi. hieu ((va nam) OR (ha nam)) truoc va hanh ((voi khoa) or (loi khoa)) viet".
• Adding a wildcard symbol may retrieve word variants: thuat sac ky lang xa hoi. hieu ((va nam) OR (ha nam)) truoc va hanh ((voi khoa) or (loi khoa)) viet*.