Perhaps you should try some spelling variations:
lang man » lang van, lang ban, lang mai
man khoi » mai khoi, van khoi, dang khoi
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
va cham » va chat, va tham
hanh va » hang va
cu tren » tu tren, dua tren
soc va » hoc va, loc va, doc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach _ lang man khoi. hieu va cham soc va ((hanh vi) or (hanh va)) cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach _ lang man khoi. hieu va cham soc va ((hanh vi) OR (hanh va)) cu tren.
• Adding a wildcard symbol may retrieve word variants: tu sach _ lang man khoi. hieu va cham soc va ((hanh vi) or (hanh va)) cu tren*.