Perhaps you should try some spelling variations:
phan dang » phan dau, phan cong, nhan dan
luan phan » luan van, luan hoan
ham luan » pham luan, han luan, phap luan
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ly nang
ty hang » ly hang, ty xang, thi hang
hieu ve » hieu va, hieu van
dang va » dang van, dang vat, hang va
ve ham » ve cham, le ham, ve am
va cau » van cau, va cac, va dau

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) OR (ty hang)) xa hoi. hieu ve ham luan phan dang va cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) OR (ty hang)) xa hoi. hieu ve ham luan phan dang va cau tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) OR (ty hang)) xa hoi. hieu ve ham luan phan dang va cau tren*.