Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
kho tang » cao tang
su sach » so sach, vu sach
dinh de » dinh ve, dinh du, dinh le
cua tre » cua te, cuu tre, cua triet
tang xa » trang xa, tang ma, lang xa
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
de cua » le cua, te cua, dieu cua
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (thuat sach)) kho tang xa hoi. lieu va cam ((xuc va) OR (tuc va)) dinh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thuat sach)) kho tang xa hoi. lieu va cam ((xuc va) OR (tuc va)) dinh de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thuat sach)) kho tang xa hoi. lieu va cam ((xuc va) OR (tuc va)) dinh de cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thuat sach)) kho tang xa hoi. lieu va cam ((xuc va) OR (tuc va)) dinh de cua tre*.