Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
thuc dan » thuc hanh, hoc dan, thuc vat
hoang di » hoang dai, hoang de, hoang da
nam thuc » nam thuoc, am thuc, nam thu
thi lan » thi hanh, thi nang, thi lien
lan nam » van nam, dan nam, ban nam
nang xa » lang xa, nang ma, mang xa
hang di » hang doi, hang vi, hang dien
tu sach » thu sach, su sach, te sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y ((nang xa) or (nang x)) hoi. thi lan nam thuc dan ((hoang di) OR (hang di)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang xa) OR (nang x)) hoi. thi lan nam thuc dan ((hoang di) OR (hang di)) va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang xa) or (nang x)) hoi. thi lan nam thuc dan ((hoang di) OR (hang di)) va triet".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) or (nang x)) hoi. thi lan nam thuc dan ((hoang di) OR (hang di)) va triet*.