Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
thuat san » thuat toan, thuat song, thuat lanh
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
cao duc » dao duc, cao suc, giao duc
cam duc » cam xuc, pham duc, nam duoc
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet

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 san)) ky lang xa hoi. hieu van ((cam duc) or (cao duc)) va thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat san)) ky lang xa hoi. hieu van ((cam duc) OR (cao duc)) va thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat san)) ky lang xa hoi. hieu van ((cam duc) or (cao duc)) va thanh dai cua tre*.