Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang cho » nang chon, ngang cho, nang cao
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
cac vuc » cac nuoc, cac vung, cac cuoc
vai cua » dai cua, hai cua, lai cua
vuc van » duc van, luc van, thuc van
hieu va » hieu qua
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
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: toc sach ky nang cho hoc. ((hieu ve) or (((hieu va) OR (lieu va)))) cac vuc van hanh vai cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang cho hoc. ((hieu ve) OR (((hieu va) OR (lieu va)))) cac vuc van hanh vai cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang cho hoc. ((hieu ve) or (((hieu va) OR (lieu va)))) cac vuc van hanh vai cua cau*".