Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hien bach » vien bach, hien hanh, dien sach
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
va hang » van hang, va nang, va lang
chu tre » cho tre, chu tri, cuu tre
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va
va chu » va che, va cau, va chi

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 y nang xa hoi. hieu ((hien bach) or (thien hach)) xuc va hang va chu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu ((hien bach) OR (thien hach)) xuc va hang va chu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu ((hien bach) or (thien hach)) xuc va hang va chu tre*.