Perhaps you should try some spelling variations:
hoc sach » hoc cac, hoc anh
thanh va » thanh van, hanh va, thanh ha
va thanh » gia thanh, ban thanh, va tinh
lang xa » lang ha, dang xay, lang van
va cao » va cac, va co, va dao
va cua » va chua, via cua, ca cua
va cam » va cham, va cac, va cai
y lang » o lang, _ lang, tay lang
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: ((hoc sach) OR (hoc sinh)) y lang xa hoi. hieu ((va cam) or (va cao)) duc va thanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc sinh)) y lang xa hoi. hieu ((va cam) OR (va cao)) duc va thanh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) OR (hoc sinh)) y lang xa hoi. hieu ((va cam) or (va cao)) duc va thanh va cua te".
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) OR (hoc sinh)) y lang xa hoi. hieu ((va cam) or (va cao)) duc va thanh va cua te*.