Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
thuy van » thuy san, thuc van, chu van
cham duc » pham duc, cham soc, pham duy
thu van » thuc van, tu van, chu van
hieu va » lieu va, hieu qua
va cham » va chat, va tham
hanh di » hanh vi, hanh de, hang di
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((thu van) OR (thuy van)) xa hoi. hieu va cham duc va ((hanh di) OR (hanh kem)) cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((thu van) OR (thuy van)) xa hoi. hieu va cham duc va ((hanh di) or (hanh kem)) cua te~".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((thu van) OR (thuy van)) xa hoi. hieu va cham duc va ((hanh di) or (hanh kem)) cua te*.