Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh vai » thanh hai, thanh van, thanh tai
dau tren » dau tien, dat tren, dau tieng
hieu van » hieu va, thien van, lieu va
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
van cam » van nam, van lam, van cau
vai dau » va dau, van dau, xvii dau
tu sach » thu sach, su sach, te sach
luc va » tuc va, loc va

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) or (thuat sach)) ky lang xa hoi. hieu van cam ((luc va) OR (duc va)) thanh vai dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) ky lang xa hoi. hieu van cam ((luc va) OR (duc va)) thanh vai dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuat sach)) ky lang xa hoi. hieu van cam ((luc va) OR (duc va)) thanh vai dau tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) ky lang xa hoi. hieu van cam ((luc va) OR (duc va)) thanh vai dau tren*.