Perhaps you should try some spelling variations:
giai thanh » gia thanh, gian thanh, giay thanh
hoang van » hang va
thuc giai » thuoc giao, hoc giai, thuc thai
cau theo » cau thi, cau tao
thanh vi » hanh vi, thanh va, thanh ve
lang van » dang van, tang van, giang van
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ke cau » ket cau
vi cau » va cau, di cau, viet cau
ve cau » va cau, ve cac, le 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 ty ((lang van) or (hoang van)) hoi. hieu ((ve cau) OR (ke cau)) thuc giai thanh vi cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((lang van) OR (hoang van)) hoi. hieu ((ve cau) OR (ke cau)) thuc giai thanh vi cau theo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((lang van) or (hoang van)) hoi. hieu ((ve cau) OR (ke cau)) thuc giai thanh vi cau theo".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((lang van) or (hoang van)) hoi. hieu ((ve cau) OR (ke cau)) thuc giai thanh vi cau theo*.