Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
va triet » va thiet, va trien, ve triet
cach van » cac van, bach van, canh van
hanh tai » hang tai, han tai, hinh tai
thuc van » thuc vat, thuc dan, thuc va
nam thuc » nam thuoc, am thuc, nam thu
hieu ha » hieu hoa, hieu va, hieu ca
nang xa » nang x, lang xa, nang ma
sach va » sach xa, sach ha, sach dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((cach van) or (sach va)) nang xa hoi. hieu ha nam thuc van ((hanh tai) OR (thanh tai)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((cach van) OR (sach va)) nang xa hoi. hieu ha nam thuc van ((hanh tai) OR (thanh tai)) va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((cach van) or (sach va)) nang xa hoi. hieu ha nam thuc van ((hanh tai) OR (thanh tai)) va triet".
• Adding a wildcard symbol may retrieve word variants: su ((cach van) or (sach va)) nang xa hoi. hieu ha nam thuc van ((hanh tai) OR (thanh tai)) va triet*.