Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cau tren » cu tren, dau tren, ca tren
dau tien » van tien
lang xa » lang ha, dang xay, lang van
va cham » va chat, va tham
soc van » oc van, sac van, soc dan
hoc van » hoc dan, hoc va, hoc vat
hanh va » hang va, hanh vi
sach o » sach lo, sac o, sach y
o lang » hoa lang, hoi lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach o lang xa hoi. lieu va cham ((soc van) OR (hoc van)) hanh va ((cau tren) or (dau tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach o lang xa hoi. lieu va cham ((soc van) OR (hoc van)) hanh va ((cau tren) OR (dau tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach o lang xa hoi. lieu va cham ((soc van) OR (hoc van)) hanh va ((cau tren) or (dau tien))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach o lang xa hoi. lieu va cham ((soc van) OR (hoc van)) hanh va ((cau tren) or (dau tien))*.