Perhaps you should try some spelling variations:
dau tieng » dau tien, cau tieng, day tieng
ban thanh » ban hanh, ban hang
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
thanh vi » hanh vi, thanh va, thanh ve
tham so » ham so, tham do, than so
te sach » toc sach
lang xa » dang xay, lang van
lang ha » long ha
so ban » sao ban, so bang, co ban
vi dau » vi dai, va dau, bi dau

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 y ((lang xa) OR (lang ha)) hoi. ((hieu van) or (thien van)) tham so ban thanh vi dau tieng~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((lang xa) OR (lang ha)) hoi. ((hieu van) OR (thien van)) tham so ban thanh vi dau tieng.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((lang xa) OR (lang ha)) hoi. ((hieu van) or (thien van)) tham so ban thanh vi dau tieng".
• Adding a wildcard symbol may retrieve word variants: te sach y ((lang xa) OR (lang ha)) hoi. ((hieu van) or (thien van)) tham so ban thanh vi dau tieng*.