Perhaps you should try some spelling variations:
hanh danh » hanh doanh, han danh, anh danh
tham thuc » nham thuc, pham thuc, tam thuc
viet cua » viec cua, viet qua, biet cua
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
viet ca » viet ha, viet co, viet a
sac ky » cac ky, sai ky

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 ky) or (sac ky)) nang xa hoi. hieu va tham thuc hanh danh ((viet cua) OR (viet ca)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((sach ky) OR (sac ky)) nang xa hoi. hieu va tham thuc hanh danh ((viet cua) OR (viet ca)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((sach ky) or (sac ky)) nang xa hoi. hieu va tham thuc hanh danh ((viet cua) OR (viet ca)) tre".
• Adding a wildcard symbol may retrieve word variants: doc ((sach ky) or (sac ky)) nang xa hoi. hieu va tham thuc hanh danh ((viet cua) OR (viet ca)) tre*.