Perhaps you should try some spelling variations:
lang mai » lang dai, lang hai, lang man
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
nang mai » nang ma, nang tai, nang cai
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
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) ly ((nang mai) or (lang mai)) hoi. hieu ve cham soc van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ly ((nang mai) OR (lang mai)) hoi. hieu ve cham soc van hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ly ((nang mai) or (lang mai)) hoi. hieu ve cham soc van hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ly ((nang mai) or (lang mai)) hoi. hieu ve cham soc van hanh di cua tre*.