Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
sach hay » sach han, sach ha, sach nay
hang xa » hoang xa, hang va, hang ca
hieu ve » hieu va, hieu van
truc va » thuc va, thuc vat, trung va
vi cua » vai cua, di cua
ve cac » va cac, vien cac
tuc va » thuc va, tuc xa, duc va
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((sach hay) or (sach thu)) hang xa hoi. hieu ve cac ((tuc va) or (truc va)) hanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach hay) OR (sach thu)) hang xa hoi. hieu ve cac ((tuc va) OR (truc va)) hanh vi cua tu.
• Adding a wildcard symbol may retrieve word variants: thuat ((sach hay) or (sach thu)) hang xa hoi. hieu ve cac ((tuc va) or (truc va)) hanh vi cua tu*.