Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
van hoan » van hoang, van hoa, van toan
van doan » van doanh, van toan, van dan
tu sach » thu sach, su sach, te sach
van cua » vang cua, ban cua, dan cua
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cua tre » cua te, cuu tre, cua triet

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) OR (nang ma)) hoi. hieu ve cham luc ((van doan) or (van hoan)) van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang xa) OR (nang ma)) hoi. hieu ve cham luc ((van doan) OR (van hoan)) van cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang xa) OR (nang ma)) hoi. hieu ve cham luc ((van doan) or (van hoan)) van cua tre*".