Perhaps you should try some spelling variations:
thu nang » thi nang, thu hang, tho nang
thu bang » thu ban, thu hang, chu bang
hieu van » hieu va, thien van, lieu va
te sach » toc sach
luc van » luoc van, luu van, duc van
hang di » hang doi, hang vi, hang dien
hanh di » hanh vi, hanh de, danh di
van cac » van hac, van cau, van bac
cac luc » cau luc, coc luc, cac nuoc
cho hoc » co hoc, khoa hoc
cua cau » cua cac, cua chu, cua cay

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 nang) or (thu bang)) cho hoc. hieu van cac luc van ((hanh di) OR (hang di)) cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((thu nang) OR (thu bang)) cho hoc. hieu van cac luc van ((hanh di) OR (hang di)) cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((thu nang) or (thu bang)) cho hoc. hieu van cac luc van ((hanh di) OR (hang di)) cua cau*".