Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
dang mam » dang nam, dang mau, dang mat
va phan » van phan, va phat, hoa phan
cuc tre » cua tre, cuu tre, cuc thue
va phap » va phat, ban phap
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
mam hoi » mam hoai, nam hoi, mai hoi
ky dang » ky nang, ky danh
duc tre » duoc tren, duc tien

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 dang mam hoi. hieu ve cham luc ((va phan) OR (va phap)) tai ((cuc tre) or (duc tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang mam hoi. hieu ve cham luc ((va phan) OR (va phap)) tai ((cuc tre) OR (duc tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang mam hoi. hieu ve cham luc ((va phan) OR (va phap)) tai ((cuc tre) or (duc tre))*".