Perhaps you should try some spelling variations:
nha thuoc » nha nuoc, nhan thuc, nha hoc
van hanh » van thanh, ban hanh, van anh
thu sach » thuat sach, thuoc sach, thu hoach
dai hoi » dai hoc, dai hai, dai moi
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
tu sach » su sach, te sach, tu cach
mai hoi » mai khoi, lai hoi, mai doi
ly nang » ky nang, ly hang, ly vang
ve cac » va cac, vien cac
vi nha » ve nha, va nha, li nha

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) or (thu sach)) ly nang ((mai hoi) OR (dai hoi)). hieu ve cac xuc van hanh vi nha thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ly nang ((mai hoi) OR (dai hoi)). hieu ve cac xuc van hanh vi nha thuoc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ly nang ((mai hoi) OR (dai hoi)). hieu ve cac xuc van hanh vi nha thuoc".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ly nang ((mai hoi) OR (dai hoi)). hieu ve cac xuc van hanh vi nha thuoc*.