Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
hieu van » hieu va, thien van, lieu va
va thanh » ban thanh, va tinh, le thanh
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
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 nang xa hoi. hieu van cam duc ((va thanh) OR (gia thanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat san)) ky nang xa hoi. hieu van cam duc ((va thanh) OR (gia thanh)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuat san)) ky nang xa hoi. hieu van cam duc ((va thanh) OR (gia thanh)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat san)) ky nang xa hoi. hieu van cam duc ((va thanh) OR (gia thanh)) dai cua tre*.