Perhaps you should try some spelling variations:
thuat sach » thuat lanh
thuat san » thuat toan, thuat song, thuat lanh
dau tren » dau tien, dat tren, dau tieng
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
hanh de » hanh ve, hanh kem
va cam » va cham, va cac, va cai
va cao » va cac, va co, va dao
luc va » duc va, tuc va, loc va
de dau » dem dau, de dao, de dat

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. lieu ((va cam) OR (va cao)) luc va hanh de dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (thuat san)) ky nang xa hoi. lieu ((va cam) OR (va cao)) luc va hanh de dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuat sach) or (thuat san)) ky nang xa hoi. lieu ((va cam) OR (va cao)) luc va hanh de dau tren".
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) or (thuat san)) ky nang xa hoi. lieu ((va cam) OR (va cao)) luc va hanh de dau tren*.