Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cham luc » cham soc, nhan luc, cham cuu
van hanh » van thanh, ban hanh, van anh
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
va cham » va chat, va tham
va hanh » va thanh, va danh, ban hanh
cu tren » tu tren, dua tren
vi cu » vi su, vi xu, vi du

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 y ((nang ma) OR (tang ma)) hoi. lieu va cham luc ((va hanh) or (van hanh)) vi cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y ((nang ma) OR (tang ma)) hoi. lieu va cham luc ((va hanh) OR (van hanh)) vi cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y ((nang ma) OR (tang ma)) hoi. lieu va cham luc ((va hanh) or (van hanh)) vi cu tren".
• Adding a wildcard symbol may retrieve word variants: thuat sach y ((nang ma) OR (tang ma)) hoi. lieu va cham luc ((va hanh) or (van hanh)) vi cu tren*.