Perhaps you should try some spelling variations:
phan dang » phan dau, phan cong, nhan dan
luan phan » luan van, luan hoan
thu sach » thuat sach, thuoc sach, thu hoach
cam luan » ham luan, pham luan, bai luan
cau tren » cu tren, dau tren, ca tren
tu sach » su sach, te sach, tu cach
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
dang va » dang van, dang vat, hang va
ve cam » ve cham, ve cac, va cam
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) OR (thu sach)) ty nang xa hoi. hieu ve cam luan phan dang va cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ty nang xa hoi. hieu ve cam luan phan dang va cau tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ty nang xa hoi. hieu ve cam luan phan dang va cau tren*.