Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hien bach » vien bach, hien hanh, dien sach
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
di cua » dai cua, doi cua, de cua
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang xa hoi. hieu ((hien bach) OR (thien hach)) tuoc ((va danh) or (va hanh)) di cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang xa hoi. hieu ((hien bach) OR (thien hach)) tuoc ((va danh) OR (va hanh)) di cua su*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang xa hoi. hieu ((hien bach) OR (thien hach)) tuoc ((va danh) or (va hanh)) di cua su*".