Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
cham luc » cham soc, nhan luc, cham cuu
vanh dai » van dai, vanh tai, lanh dao
su sach » so sach, vu sach
ly nang » ky nang, ly hang, ly vang
va vanh » va van, va danh, va hanh
y nang » ky nang, v nang, may nang
co hoi » co hoc, co loi
luc va » duc va, tuc va, loc va
cua te » cua tu
cua su » qua su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((y nang) OR (ly nang)) co hoi. hieu qua cham luc va vanh dai ((cua te) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (ly nang)) co hoi. hieu qua cham luc va vanh dai ((cua te) OR (cua su))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) OR (ly nang)) co hoi. hieu qua cham luc va vanh dai ((cua te) or (cua su))*".