Perhaps you should try some spelling variations:
hieu van » thien van, lieu va
thi hanh » thi thanh
hanh cho » danh cho, hang cho, han cho
van hanh » van thanh, ban hanh, van anh
sach thi » sach thu, sach tai, sach thieu
te sach » toc sach
hanh di » hanh vi, hanh de, hang di
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
hieu va » lieu va, hieu qua
cho hoc » co hoc, khoa hoc
cua cau » cua cac, cua chu, cua cay
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 thi hanh cho hoc. ((((hieu ve) OR (hieu va))) or (hieu van)) cac xuc van hanh di cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thi hanh cho hoc. ((((hieu ve) OR (hieu va))) OR (hieu van)) cac xuc van hanh di cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thi hanh cho hoc. ((((hieu ve) OR (hieu va))) or (hieu van)) cac xuc van hanh di cua cau*".