Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
cac loc » cac lop, cac toc, cac hoc
loc va » hoc va, luc va
va don » va dong, va doc, va do
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: ((thu sach) OR (tu sach)) ky nang xa hoi. ((hieu va) or (lieu va)) cac loc va don vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky nang xa hoi. ((hieu va) OR (lieu va)) cac loc va don vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) ky nang xa hoi. ((hieu va) or (lieu va)) cac loc va don vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (tu sach)) ky nang xa hoi. ((hieu va) or (lieu va)) cac loc va don vi cua te*.