Perhaps you should try some spelling variations:
thuat sach » thuat lanh
thuat san » thuat toan, thuat song, thuat lanh
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hoa lang » hoa dan, hoa van
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va lang » va nang
thi cua » thai cua, thi cuc, tri cua
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 sach) or (thuat san)) ky nang xa hoi. hieu va cac nuoc ((va lang) OR (hoa lang)) thi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (thuat san)) ky nang xa hoi. hieu va cac nuoc ((va lang) OR (hoa lang)) thi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuat sach) or (thuat san)) ky nang xa hoi. hieu va cac nuoc ((va lang) OR (hoa lang)) thi cua te".
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) or (thuat san)) ky nang xa hoi. hieu va cac nuoc ((va lang) OR (hoa lang)) thi cua te*.