Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hien bach » vien bach, hien hanh, dien sach
van nang » van quang, van ban, van dong
tu sach » thu sach, su sach, te sach
lang va » lang van, hang va, lang ha
va lang » va nang, hoa lang
cuu tre » cua tre, cau tren, cau treo
xuc va » duc va, tuc va, luc va
v nang » va nang, vu nang, voi nang
va cuu » va cau, va chu, va 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 ((v nang) OR (van nang)) xa hoi. hieu ((hien bach) or (thien hach)) xuc va lang va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((v nang) OR (van nang)) xa hoi. hieu ((hien bach) OR (thien hach)) xuc va lang va cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((v nang) OR (van nang)) xa hoi. hieu ((hien bach) or (thien hach)) xuc va lang va cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((v nang) OR (van nang)) xa hoi. hieu ((hien bach) or (thien hach)) xuc va lang va cuu tre*.