Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thu hang » thi hang, thuc hanh, thu huong
danh vai » danh sai, danh va, doanh van
vai cua » dai cua, hai cua, lai cua
hang xa » hoang xa, hang va, hang ca
va danh » va dinh, va dan, va hanh
ve cai » va cai, ve cac, ve tai
va cam » va cham, va cac, va cao
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: ((te sach) OR (toc sach)) thu hang xa hoi. hieu ((ve cai) or (va cam)) duc va danh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) thu hang xa hoi. hieu ((ve cai) OR (va cam)) duc va danh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) thu hang xa hoi. hieu ((ve cai) or (va cam)) duc va danh vai cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) thu hang xa hoi. hieu ((ve cai) or (va cam)) duc va danh vai cua te*.