Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van tuan » van quan, van ban, anh tuan
tuan te » tuan le, tuan ts, tuan tu
luc van » luoc van, luu van, duc van
cam luc » cam xuc, cau luc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
te cua » tue cua, le cua, de cua

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) or (hieu qua)) cam luc van tuan te 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) OR (hieu qua)) cam luc van tuan te 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) or (hieu qua)) cam luc van tuan te cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) y nang xa hoi. ((hieu va) or (hieu qua)) cam luc van tuan te cua tre*.