Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
cac dac » cac dan, cac dai, cac bac
van mat » van dat, van man, van mao
mat cuu » mat cua
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
dac va » duc va, day va, dat va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang xa hoi. ((hieu va) or (lieu va)) cac dac va van mat cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. ((hieu va) OR (lieu va)) cac dac va van mat cuu tre*.