Perhaps you should try some spelling variations:
bo sach » co sach, hoc sach
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cac luc » cau luc, cac nuoc, cac cuoc
tinh de » tinh da, sinh de, tinh he
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, tay lang
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach y lang xa hoi. hieu va ((cac luc) OR (coc luc)) may tinh de cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach y lang xa hoi. hieu va ((cac luc) OR (coc luc)) may tinh de cua tre".
• Adding a wildcard symbol may retrieve word variants: bo sach y lang xa hoi. hieu va ((cac luc) OR (coc luc)) may tinh de cua tre*.