Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach thi » sach thu, sach tai, sach thieu
hanh vai » hanh vi, hanh va, hanh tai
hieu van » hieu va, thien van, lieu va
thi hang » thi hanh, thi nang, thi hong
hieu ve » hieu va
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
hang co » hang cho, hang ca, nang co
vai cua » dai cua, hai cua, lai cua
cua cau » cua cac, cua chu, cua cay

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach thi hang co hoc. ((hieu ve) or (hieu van)) cac ((xuc van) OR (duc van)) hanh vai cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thi hang co hoc. ((hieu ve) OR (hieu van)) cac ((xuc van) OR (duc van)) hanh vai cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach thi hang co hoc. ((hieu ve) or (hieu van)) cac ((xuc van) OR (duc van)) hanh vai cua cau*".