Perhaps you should try some spelling variations:
vanh tai » van tai, hanh tai, anh tai
vanh dai » van dai, lanh dao, van dao
nhan luc » nang luc
sach ky » sac ky, sach y, sach kem
va nhan » van nhan, ca nhan, va phan
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc 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 (sach ty)) dang xa hoi. hieu va nhan luc va ((vanh dai) or (vanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) dang xa hoi. hieu va nhan luc va ((vanh dai) OR (vanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach ty)) dang xa hoi. hieu va nhan luc va ((vanh dai) or (vanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach ty)) dang xa hoi. hieu va nhan luc va ((vanh dai) or (vanh tai)) cua tre*.