Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thuat lap » thuat lanh, thuat xay, thuat bai
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, mang xa
duc van » duc va, duc tan, duc manh
cac duc » cac du, cao duc, cac dac
nang ma » tang ma, sang ma, nang cao
vi cua » vai cua, di 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 lap)) v ((nang xa) OR (nang ma)) hoi. lieu va cac duc van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (thuat lap)) v ((nang xa) OR (nang ma)) hoi. lieu va cac duc van hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuat sach) or (thuat lap)) v ((nang xa) OR (nang ma)) hoi. lieu va cac duc van hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) or (thuat lap)) v ((nang xa) OR (nang ma)) hoi. lieu va cac duc van hanh vi cua te*.