Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
dinh cau » dinh chau, dinh cuu, dinh cu
thi van » thi lan, thi hanh, thi nang
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
nang xa » nang x, lang xa, nang ma
cau cua » cau qua, ca cua, cu cua
cua tre » cua te, cuu tre, cua triet
tuc va » truc va, 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: doc sach ky nang xa hoi. ((thien van) or (thi van)) cham ((tuc va) OR (thuc va)) dinh cau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky nang xa hoi. ((thien van) OR (thi van)) cham ((tuc va) OR (thuc va)) dinh cau cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ky nang xa hoi. ((thien van) or (thi van)) cham ((tuc va) OR (thuc va)) dinh cau cua tre".
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang xa hoi. ((thien van) or (thi van)) cham ((tuc va) OR (thuc va)) dinh cau cua tre*.