Perhaps you should try some spelling variations:
manh thanh » danh thanh, minh thanh, manh thang
thanh hoi » thanh hoai, thanh hoa, thanh hai
cau tren » cu tren, dau tren, ca tren
duc manh » suc manh, duc anh, duc minh
hieu van » hieu va, thien van, lieu va
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet
su sach » so sach
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano
vu sach » vu bach, vu khach
van cam » van nam, van lam, van cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu sach)) tu nang xa hoi. hieu van cam duc manh thanh hoi ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) tu nang xa hoi. hieu van cam duc manh thanh hoi ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) tu nang xa hoi. hieu van cam duc manh thanh hoi ((cua tre) or (cau tren))*.