Perhaps you should try some spelling variations:
thien van » thi van
hau truc » cau truc, hang truc, hoc truc
dang xay » dang van, van xay
sach ty » sach tu, sach thu, xach tay
van hau » van ha, van hai, van dau
cua tre » cua te, cuu tre, cua triet
xay cho » day cho, cay cho, xay chen
va dan » ca dan, va dao, va dap
va dau » va dao
di cua » dai cua, doi cua, de cua

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) or (sach y)) dang xay cho. thien van hau truc ((va dan) or (va dau)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach y)) dang xay cho. thien van hau truc ((va dan) OR (va dau)) di cua tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach y)) dang xay cho. thien van hau truc ((va dan) or (va dau)) di cua tre*.