Perhaps you should try some spelling variations:
thieu nang » thien nang, thieu khang, thieu quang
sanh thieu » sach thieu, thanh thieu, hanh thiet
chuan ha » chuan he, quan ha, chuan bi
hieu van » hieu va, thien van, lieu va
van kham » van tham, va kham, van khai
so sanh » do sanh
lai cua » dai cua, hai cua, lai chau
vai cua » dai cua, hai cua, bai cua
chua va » chuc va, chua may
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh thieu nang ma hoi. hieu van kham ((chua va) OR (chuan ha)) hanh ((vai cua) or (lai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh thieu nang ma hoi. hieu van kham ((chua va) OR (chuan ha)) hanh ((vai cua) OR (lai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh thieu nang ma hoi. hieu van kham ((chua va) OR (chuan ha)) hanh ((vai cua) or (lai cua)) te".
• Adding a wildcard symbol may retrieve word variants: so sanh thieu nang ma hoi. hieu van kham ((chua va) OR (chuan ha)) hanh ((vai cua) or (lai cua)) te*.