Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nhan luc » nang luc
cham luc » cham soc, cham cuu, chat lua
dau tien » van tien
dang xay » dang van, van xay
xay hoi » xa hoi, tay hoi, cay phoi
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
ca tren » cau tren, cu tren, la tren
sach o » sach lo, sac o, sach y
o dang » xo dang, do dang, so dang

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach o dang xay hoi. lieu va ((cham luc) or (nhan luc)) va hanh va ((ca tren) or (dau tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach o dang xay hoi. lieu va ((cham luc) OR (nhan luc)) va hanh va ((ca tren) OR (dau tien)).
• Adding a wildcard symbol may retrieve word variants: thuoc sach o dang xay hoi. lieu va ((cham luc) or (nhan luc)) va hanh va ((ca tren) or (dau tien))*.