Perhaps you should try some spelling variations:
hanh trau » hanh tram, hanh trang, thanh tran
trau cua » tru cua, tranh cua, tu cua
toc sach » hoc sach, doc sach, thuoc sach
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
loc va » hoc va, luc va
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) y nang xa hoi. hieu va cam ((tuc va) or (loc va)) hanh trau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) y nang xa hoi. hieu va cam ((tuc va) OR (loc va)) hanh trau cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) y nang xa hoi. hieu va cam ((tuc va) or (loc va)) hanh trau cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) y nang xa hoi. hieu va cam ((tuc va) or (loc va)) hanh trau cua tre*.