Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh tra » thanh toan, thanh hoa
van thanh » ban thanh, van tuan
nang mai » nang ma, nang tai, lang mai
tu sach » thu sach, su sach, te sach
tra cua » trau cua, trua cua, tra cuu
tuc van » thuc van, truc van, tuc va
cua tre » cua te, cuu tre, cua triet
mai hoi » mai khoi, dai hoi, lai hoi
va cam » va cham, va cac, va cao
ve cam » ve cham, ve cac, ve cai

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 (thuat sach)) ky nang mai hoi. hieu ((ve cam) or (va cam)) tuc van thanh tra cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) ky nang mai hoi. hieu ((ve cam) OR (va cam)) tuc van thanh tra cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) ky nang mai hoi. hieu ((ve cam) or (va cam)) tuc van thanh tra cua tre*.