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