Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
nam thuc » nam thuoc, am thuc, nam thu
sach ly » sach lo, sach ty, sach hay
hieu ve » hieu va, hieu van
hang ca » hang va, nang cao, hang tai
ca hoi » cau hoi, cua hoi, xa hoi
ve nam » he nam, va nam, le nam
vi su » va su, ve su, oi su
ki su » ky su

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 ly) or (sach y)) hang ca hoi. hieu ve nam thuc van hanh ((vi su) or (ki su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ly) OR (sach y)) hang ca hoi. hieu ve nam thuc van hanh ((vi su) OR (ki su)) triet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ly) or (sach y)) hang ca hoi. hieu ve nam thuc van hanh ((vi su) or (ki su)) triet*.