Perhaps you should try some spelling variations:
sach han » sach tham, sach danh, sach nang
han nang » phan nang, van nang, ban nang
thuc van » thuc vat, thuc dan, thuc hanh
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
thuc va » thuc vat, thuc dan, thuc day
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 han nang xa hoi. hieu ve cham ((thuc van) OR (thuc va)) hanh ((vi cua) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach han nang xa hoi. hieu ve cham ((thuc van) OR (thuc va)) hanh ((vi cua) OR (di cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach han nang xa hoi. hieu ve cham ((thuc van) OR (thuc va)) hanh ((vi cua) or (di cua)) tre".
• Adding a wildcard symbol may retrieve word variants: vu sach han nang xa hoi. hieu ve cham ((thuc van) OR (thuc va)) hanh ((vi cua) or (di cua)) tre*.