Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
chien bach » vien bach, chien dich, chiet tach
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
huu tre » huu tri, cuu tre, huu them
bac va » ban va, bac ha, bao va
luc va » duc va, tuc va, loc va
va huu » vu huu

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 ty nang xa hoi. chieu ((chien bach) or (thien hach)) ((bac va) or (luc va)) hang va huu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. chieu ((chien bach) OR (thien hach)) ((bac va) OR (luc va)) hang va huu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. chieu ((chien bach) or (thien hach)) ((bac va) or (luc va)) hang va huu tre*.