Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
sao ban » tao ban, cao bang, tao bang
sac ban » cac ban, sac ba, sac ben
va tham » van tham, va cham, va thanh
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cu tren » tu tren, dua tren
vi cu » vi su, vi xu, vi du

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 va tham ((sac ban) or (sao ban)) hanh vi cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) ty nang xa hoi. hieu va tham ((sac ban) OR (sao ban)) hanh vi cu tren.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuoc sach)) ty nang xa hoi. hieu va tham ((sac ban) or (sao ban)) hanh vi cu tren*.