Perhaps you should try some spelling variations:
loai tren » la tren, thai tren
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
cau tren » cu tren, dau tren, ca tren
danh xa » danh ca, dinh xa, canh xa
vu cham » va cham, tu cham, qua cham
vu kham » vu khanh
xuc van » duc van, luc van, vuc 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: thu sach y danh xa hoi. hieu ((vu cham) OR (vu kham)) xuc van hanh vi ((cau tren) or (loai tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y danh xa hoi. hieu ((vu cham) OR (vu kham)) xuc van hanh vi ((cau tren) OR (loai tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y danh xa hoi. hieu ((vu cham) OR (vu kham)) xuc van hanh vi ((cau tren) or (loai tren))*".