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