Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thai cua » than cua, tai cuc, dai cua
su sach » so sach
vu sach » vu bach, vu khach
nang xa » nang x, lang xa, nang ma
van bac » van ban, van bao, van hac
bac hoc » bai hoc, bac ho
va hanh » van hanh, va thanh, va danh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (vu sach)) ky nang xa hoi. hieu van bac hoc va hanh ((thai cua) or (tri cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang xa hoi. hieu van bac hoc va hanh ((thai cua) OR (tri cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky nang xa hoi. hieu van bac hoc va hanh ((thai cua) or (tri cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ky nang xa hoi. hieu van bac hoc va hanh ((thai cua) or (tri cua)) tre*.