Perhaps you should try some spelling variations:
loai tren » la tren, thai tren
cau tren » cu tren, dau tren, ca tren
van hanh » van thanh, ban hanh, van anh
thu sach » tu sach, thuat sach, thuoc sach
vu cham » va cham, vu kham, qua cham
sach ky » sac ky, sach y, sach ty
tu cham » toc cham, thi cham
xuc van » duc van, luc van, vuc van
danh xa » danh ca, dinh xa, canh xa
ky danh » ky anh, ky dang

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 ky danh xa hoi. hieu ((vu cham) OR (tu cham)) xuc van hanh vi ((cau tren) or (loai tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky danh xa hoi. hieu ((vu cham) OR (tu cham)) xuc van hanh vi ((cau tren) OR (loai tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky danh xa hoi. hieu ((vu cham) OR (tu cham)) xuc van hanh vi ((cau tren) or (loai tren))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky danh xa hoi. hieu ((vu cham) OR (tu cham)) xuc van hanh vi ((cau tren) or (loai tren))*.