Perhaps you should try some spelling variations:
thi hang » thi hanh, thi nang, thi hong
van hanh » van thanh, ban hanh, van anh
vuc van » duc van, luc van, thuc van
cac vuc » cac nuoc, cac vung, cac cuoc
hieu va » lieu va, hieu qua
cho hoc » co hoc, khoa hoc
te sach » toc sach
ty hang » ly hang, ty xang, thu hang
ty tang » tay tang, ty xang, ky tang
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 tang) or (((ty hang) OR (thi hang)))) cho hoc. hieu va cac vuc van hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty tang) OR (((ty hang) OR (thi hang)))) cho hoc. hieu va cac vuc van hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty tang) or (((ty hang) OR (thi hang)))) cho hoc. hieu va cac vuc van hanh vi cua cau*".