Perhaps you should try some spelling variations:
thuoc sach » nuoc sach, thuat sach, thuoc sinh
ban hanh » ban hang
hoc sach » hoc sinh, hoc cac, hoc anh
loc quoc » hoc quoc, duoc quoc, duc quoc
hieu van » hieu va, thien van, lieu va
loc luc » coc luc
lang xa » lang ha, dang xay, lang van
y lang » o lang, _ lang, tay lang
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: ((thuoc sach) or (hoc sach)) y lang xa hoi. hieu van ((loc luc) OR (loc quoc)) ban hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (hoc sach)) y lang xa hoi. hieu van ((loc luc) OR (loc quoc)) ban hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) or (hoc sach)) y lang xa hoi. hieu van ((loc luc) OR (loc quoc)) ban hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (hoc sach)) y lang xa hoi. hieu van ((loc luc) OR (loc quoc)) ban hanh vi cua te*.