Perhaps you should try some spelling variations:
doc sach » hoc sach, nuoc sach, dac sac
nang cho » nang chon, ngang cho, sang cho
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
toc sach » hoc sach, thuoc sach, nuoc sach
hieu ve » hieu va, hieu van
cac vuc » cac nuoc, cac vung, cac cuoc
vuc van » duc van, luc van, thuc van
vai cua » dai cua, hai cua, lai cua
cua cau » cua cac, cua chu, cua cay
ve cac » va cac, vien cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc sach) OR (toc sach)) ty ((nang cho) or (nang cao)) hoc. hieu ve cac vuc van hanh vai cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (toc sach)) ty ((nang cho) OR (nang cao)) hoc. hieu ve cac vuc van hanh vai cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc sach) OR (toc sach)) ty ((nang cho) or (nang cao)) hoc. hieu ve cac vuc van hanh vai cua cau*".