Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
minh via » minh va, minh vua, minh giao
hieu van » hieu va, thien van, lieu va
via cua » gia cua, gian cua, giau cua
cac lop » cac hop, cac loai
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cac co » cac cong
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 (thuoc sach)) ty nang xa hoi. hieu van ((cac lop) or (cac co)) van minh via cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) ty nang xa hoi. hieu van ((cac lop) OR (cac co)) van minh via cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuoc sach)) ty nang xa hoi. hieu van ((cac lop) or (cac co)) van minh via cua te".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuoc sach)) ty nang xa hoi. hieu van ((cac lop) or (cac co)) van minh via cua te*.