Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
loai tren » la tren, thai tren
cham luc » cham soc, nhan luc, cham cuu
van hanh » van thanh, ban hanh, van anh
cau tren » cu tren, dau tren, ca tren
danh xa » danh ca, dinh xa, canh xa
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
luc van » luoc van, luu van, duc van
y danh » ky danh, ly danh, 1 danh

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 y danh xa hoi. hieu vu cham luc van hanh vi ((cau tren) or (loai tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y danh xa hoi. hieu vu cham luc van hanh vi ((cau tren) OR (loai tren)).
• Adding a wildcard symbol may retrieve word variants: thuoc sach y danh xa hoi. hieu vu cham luc van hanh vi ((cau tren) or (loai tren))*.