Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuoc sinh
thuat sach » thuat lanh, thuat san
tinh van » trinh van, dinh van, tich van
ly hang » ly quang
hang xa » hoang xa, hang va, hang ca
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
tinh va » tich va, trinh van, trinh vat
cua tre » cua te, cuu tre, cua triet

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) or (thuat sach)) ly hang xa hoi. hieu va cac duc va ((tinh van) OR (tinh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (thuat sach)) ly hang xa hoi. hieu va cac duc va ((tinh van) OR (tinh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) or (thuat sach)) ly hang xa hoi. hieu va cac duc va ((tinh van) OR (tinh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (thuat sach)) ly hang xa hoi. hieu va cac duc va ((tinh van) OR (tinh va)) cua tre*.