Perhaps you should try some spelling variations:
sach thi » sach thu, sach thieu, sach tham
sach tai » sach bai, sach tham, sach dao
hang cho » sang cho, hang khoa, phong cho
van hanh » van thanh, ban hanh, van anh
cho hoc » co hoc, khoa hoc
hieu va » lieu va, hieu qua
cac vuc » cac nuoc, cac vung, cac cuoc
vuc van » duc van, luc van, thuc van
vai cua » dai cua, hai cua, lai cua
vi 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 thi) OR (sach tai)) hang cho hoc. hieu va cac vuc van hanh ((vi cua) or (vai cua)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach thi) OR (sach tai)) hang cho hoc. hieu va cac vuc van hanh ((vi cua) OR (vai cua)) cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach thi) OR (sach tai)) hang cho hoc. hieu va cac vuc van hanh ((vi cua) or (vai cua)) cau*".