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
thai cua » than cua, tai cuc, tri cua
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va lang » va nang, hoa lang
thi cua » thi cuc, tri cua, thi dua

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 ((thi cua) OR (thai 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 ((thi cua) OR (thai 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 ((thi cua) OR (thai 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 ((thi cua) OR (thai cua)) te*.