Perhaps you should try some spelling variations:
nang dai » nang dau, nang tai, lang dai
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
sach ky » sach y, sach ty, sach kem
dai moi » doi moi, dai hoi
xuc van » duc van, luc van, vuc van
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((sach ky) or (sac ky)) nang dai moi. lieu va cam xuc van hanh tai ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((sach ky) OR (sac ky)) nang dai moi. lieu va cam xuc van hanh tai ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: hoc ((sach ky) or (sac ky)) nang dai moi. lieu va cam xuc van hanh tai ((cua te) or (cua tu))*.