Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cac truc » cau truc, cac tru, cac trung
van tuan » van quan, van ban, anh tuan
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
truc va » thuc va, thuc vat, trung va
van tai » von tai
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: ((tu sach) or (toc sach)) ky nang xa hoi. lieu va cac truc va ((van tai) OR (van tuan)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky nang xa hoi. lieu va cac truc va ((van tai) OR (van tuan)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (toc sach)) ky nang xa hoi. lieu va cac truc va ((van tai) OR (van tuan)) cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ky nang xa hoi. lieu va cac truc va ((van tai) OR (van tuan)) cua te*.