Perhaps you should try some spelling variations:
loai tren » la tren, thai tren
van hanh » van thanh, ban hanh, van anh
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
danh xa » danh ca, dinh xa, canh xa
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
soc van » hoc van, oc van, sac van

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