Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cau tren » cu tren, dau tren, ca tren
van hanh » van thanh, ban hanh, van anh
hanh di » hanh vi, hanh de, hang di
soc van » hoc van, oc van, sac van
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
su sach » so sach, vu sach
nang xa » lang xa, nang ma, mang xa
di cau » da cau, diem cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (thuoc sach)) ty ((nang xa) or (nang x)) hoi. hieu ve cham soc van hanh di cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thuoc sach)) ty ((nang xa) OR (nang x)) hoi. hieu ve cham soc van hanh di cau tren.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thuoc sach)) ty ((nang xa) or (nang x)) hoi. hieu ve cham soc van hanh di cau tren*.