Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cau tren » cu tren, dau tren, ca tren
nang co » nang cao, nang doc, nang noi
sach ty » sach y, sach tu, sach thu
sach ky » sac ky, sach y, sach kem
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
va cau » van cau, va cac, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((sach ky) OR (sach ty)) nang co hoc. hieu van cham luc ((va hanh) or (va danh)) va cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ky) OR (sach ty)) nang co hoc. hieu van cham luc ((va hanh) OR (va danh)) va cau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach ky) OR (sach ty)) nang co hoc. hieu van cham luc ((va hanh) or (va danh)) va cau tren*".