Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
hanh doi » thanh doi, hanh noi, hang doi
van hanh » van thanh, ban hanh, van anh
nang cho » nang chon, ngang cho, nang cao
doi cua » dai cua, hoi cua
xuc van » duc van, luc van, vuc van
cua cau » cua cac, cua chu, cua cay
sach ky » sac ky, sach y, sach kem
cho hoc » co hoc, khoa hoc
sach ty » sach y, sach tu, sach thu
ve cac » va cac

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) or (sach ty)) nang cho hoc. hieu ((ve cac) OR (vien cac)) xuc van hanh doi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ky) OR (sach ty)) nang cho hoc. hieu ((ve cac) OR (vien cac)) xuc van hanh doi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ky) or (sach ty)) nang cho hoc. hieu ((ve cac) OR (vien cac)) xuc van hanh doi cua cau*".