Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuoc sinh
thuat sach » thuat lanh, thuat san
dinh dau » dinh dat, dinh du, danh dau
van cham » van chat, van tham, va cham
nang xa » nang x, lang xa, nang ma
thi van » thi lan, thi hanh, thi nang
dau cua » dai cua, day cua, cau cua
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, 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: ((thuoc sach) or (thuat sach)) ky nang xa hoi. thi van cham ((tuc va) OR (tuc xa)) dinh dau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (thuat sach)) ky nang xa hoi. thi van cham ((tuc va) OR (tuc xa)) dinh dau cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) or (thuat sach)) ky nang xa hoi. thi van cham ((tuc va) OR (tuc xa)) dinh dau cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (thuat sach)) ky nang xa hoi. thi van cham ((tuc va) OR (tuc xa)) dinh dau cua tre*.