Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
tang van » hoang van, trong van, tang luan
thanh vi » hanh vi, thanh va, thanh ve
dang van » hoang van, hang va
hieu van » hieu va, thien van, lieu va
sach thu » sach thue, sach thieu, sach tham
hau loc » huu loc, phau hoc
te sach » toc sach
cau hoc » cau hoi, cau hoa, cao hoc
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 thu ((tang van) OR (dang van)) hoe. hieu van ((cau hoc) or (hau loc)) gia thanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu ((tang van) OR (dang van)) hoe. hieu van ((cau hoc) OR (hau loc)) gia thanh vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu ((tang van) OR (dang van)) hoe. hieu van ((cau hoc) or (hau loc)) gia thanh vi cau tren".
• Adding a wildcard symbol may retrieve word variants: te sach thu ((tang van) OR (dang van)) hoe. hieu van ((cau hoc) or (hau loc)) gia thanh vi cau tren*.