Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
cham sat » cham mat, cham soc, khao sat
van hanh » van thanh, ban hanh, van anh
ty hang » ly hang, ty xang, thi hang
hang xa » hoang xa, hang va, hang ca
hieu va » lieu va, hieu qua
va cham » va chat, va tham
sat van » sat va, hat van, hoat van
hanh va » hang va, hanh vi
ca tren » cau tren, cu tren, la tren
va ca » va cac, va cao, va cai

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) or (hoc sach)) ty hang xa hoi. hieu va cham sat van hanh va ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (hoc sach)) ty hang xa hoi. hieu va cham sat van hanh va ca tren.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (hoc sach)) ty hang xa hoi. hieu va cham sat van hanh va ca tren*.