Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach tu, sach thu
van cau » van dau, van hau, van chat
xa hanh » xa thanh, xa khanh, va hanh
vai cua » hai cua, lai cua, bai cua
cau tu » dau tu, cau truc
tu xa » tu xay, tu va, te xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty ((lang xa) or (nang x)) hoi. hieu van cau tu xa hanh ((vai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((lang xa) OR (nang x)) hoi. hieu van cau tu xa hanh ((vai cua) OR (dai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((lang xa) or (nang x)) hoi. hieu van cau tu xa hanh ((vai cua) or (dai cua)) tre*.