Perhaps you should try some spelling variations:
thuoc sach » nuoc sach, thuat sach, thuoc sinh
hoc sach » hoc sinh, hoc cac, hoc anh
hanh vai » hanh va, hanh tai, hanh van
va giao » van giao, va giai, va gia
hieu va » lieu va, hieu qua
nong xa » song xa, dong xa, nong va
tu nong » tu dong, tu cong, tu tong
cua tre » cua te, cuu tre, cua triet
duc xa » duoc xa, tuc xa, duc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc sach) or (thuoc sach)) tu nong xa hoi. hieu va giao duc xa ((hanh vai) OR (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (thuoc sach)) tu nong xa hoi. hieu va giao duc xa ((hanh vai) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) or (thuoc sach)) tu nong xa hoi. hieu va giao duc xa ((hanh vai) OR (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (thuoc sach)) tu nong xa hoi. hieu va giao duc xa ((hanh vai) OR (hanh vi)) cua tre*.