Perhaps you should try some spelling variations:
thuoc sach » nuoc sach, thuat sach, thuoc sinh
ban thanh » ban hanh, ban hang
hoc sach » hoc sinh, hoc cac, hoc anh
thanh di » thanh doi, thanh de, thanh do
va tham » van tham, va cham, va thanh
luc ban » duc ban, cuc ban, luc bat
cu tren » tu tren, dua tren
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
ve cam » ve cham, ve cac, va cam
di cu » di cau, di cua, di du

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc sach) or (thuoc sach)) ky lang xa hoi. hieu ((ve cam) or (va tham)) luc ban thanh di cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (thuoc sach)) ky lang xa hoi. hieu ((ve cam) OR (va tham)) luc ban thanh di cu tren.
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (thuoc sach)) ky lang xa hoi. hieu ((ve cam) or (va tham)) luc ban thanh di cu tren*.