Perhaps you should try some spelling variations:
luan phan » luan van, luan hoan
cham luan » pham luan, ham luan, phap luan
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
dang va » dang van, dang vat, dung 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 ty nang xa hoi. hieu vu cham luan phan ((dang va) or (hang va)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu vu cham luan phan ((dang va) OR (hang va)) cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu vu cham luan phan ((dang va) or (hang va)) cau tren*.