Perhaps you should try some spelling variations:
thien van » thi van
quan van » luan van, quan va, quan luan
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
qua van » qua ban, qua san, qua va
hanh di » hanh vi, hanh de, hang di

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 ky nang xa hoi. thien van nam ((qua van) OR (quan van)) ((hanh di) or (hanh kem)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. thien van nam ((qua van) OR (quan van)) ((hanh di) OR (hanh kem)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. thien van nam ((qua van) OR (quan van)) ((hanh di) or (hanh kem)) cau tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. thien van nam ((qua van) OR (quan van)) ((hanh di) or (hanh kem)) cau tren*.