Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
hoc sach » hoc sinh, hoc cac, hoc anh
co sach » bo sach, cuon sach
va hanh » van hanh, va thanh, va danh
cac tuc » cac toc, cac tu, cac tac
hieu ve » hieu va, hieu van
cuc tre » duc tre, cua tre, cuu tre
hang xa » hoang xa, hang ca, lang xa
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((co sach) OR (hoc sach)) y ((hang xa) or (hang va)) hoi. hieu ve cac tuc va hanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((co sach) OR (hoc sach)) y ((hang xa) OR (hang va)) hoi. hieu ve cac tuc va hanh tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((co sach) OR (hoc sach)) y ((hang xa) or (hang va)) hoi. hieu ve cac tuc va hanh tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: ((co sach) OR (hoc sach)) y ((hang xa) or (hang va)) hoi. hieu ve cac tuc va hanh tai cuc tre*.