Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
van hanh » van thanh, ban hanh, van anh
thai cua » than cua, tri cua, dai cua
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
duc van » duc va, duc tan, duc manh

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty nang xa hoi. hieu van pham duc van hanh ((thai cua) or (tai cuc)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang xa hoi. hieu van pham duc van hanh ((thai cua) OR (tai cuc)) te.
• Adding a wildcard symbol may retrieve word variants: so sach ty nang xa hoi. hieu van pham duc van hanh ((thai cua) or (tai cuc)) te*.