Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
bac thuc » bao thuc, bac thua, cach thuc
vat hanh » vat thanh, van hanh, va hanh
vu sach » vu bach, vu khach
su sach » so sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
van bac » van ban, van bao, van hac
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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

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