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

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) OR (cham cuu)) va phan 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) OR (cham cuu)) va phan 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) OR (cham cuu)) va phan tai ((cuc tre) or (duc tre))*".