Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
van hoc » van hoa
qua cau » quan cau, qua cac, qua ca
luc van » luoc van, duc van, luc va
luu van » cuu van, luan van, luu hanh
y lang » _ lang, tay lang, yen lang
o lang » hoa lang, hoi 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: tu sach ((y lang) or (o lang)) van hoc. hieu qua cau ((luc van) OR (luu van)) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y lang) OR (o lang)) van hoc. hieu qua cau ((luc van) OR (luu van)) hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y lang) or (o lang)) van hoc. hieu qua cau ((luc van) OR (luu van)) hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y lang) or (o lang)) van hoc. hieu qua cau ((luc van) OR (luu van)) hanh vi cua te*.