Perhaps you should try some spelling variations:
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
truc va » thuc va, thuc vat, trung va
dau thi » cau thi, dan thi, dao thi
thi cuu » thi cuc, thi huu, thi cu
cuu tre » cua tre, cau tren, cau treo
sac ky » cac ky, sai ky
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: tu ((sach ky) or (sac ky)) nang xa hoi. lieu va cac ((tuc va) OR (truc va)) dau thi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang xa hoi. lieu va cac ((tuc va) OR (truc va)) dau thi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) nang xa hoi. lieu va cac ((tuc va) OR (truc va)) dau thi cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang xa hoi. lieu va cac ((tuc va) OR (truc va)) dau thi cuu tre*.