Perhaps you should try some spelling variations:
thien van » thi van
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
hoc ban » hoc bang, hoc bai, hoc can
ky lang » ky nang, ky dang, ky tang
hang vi » hang va, hanh vi, hang di
te sach » toc sach
vi cau » va cau, ve cau, di cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky lang xa hoi. ((lieu va) or (thien van)) tham ((hoc ban) OR (hoc dan)) hang vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang xa hoi. ((lieu va) OR (thien van)) tham ((hoc ban) OR (hoc dan)) hang vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang xa hoi. ((lieu va) or (thien van)) tham ((hoc ban) OR (hoc dan)) hang vi cau tren".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. ((lieu va) or (thien van)) tham ((hoc ban) OR (hoc dan)) hang vi cau tren*.