Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
va trien » va truyen, va thiet
lang van » dang van, tang van, hoang van
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
hanh ki » hanh vi, hanh ky, hanh kien
te sach » toc sach
hieu su » hieu sau, tieu su, hieu so
hieu vu » hieu va, hieu ve, dieu vu
van hoi » van hoa, van hoc, van hoe
sach o » sach lo, sac o, sach y
o lang » hoa lang, hoi lang
ki va » khi va, ke va, bi va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach o lang van hoi. ((hieu vu) OR (hieu su)) nham thuc van hanh ki va trien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach o lang van hoi. ((hieu vu) OR (hieu su)) nham thuc van hanh ki va trien".
• Adding a wildcard symbol may retrieve word variants: te sach o lang van hoi. ((hieu vu) OR (hieu su)) nham thuc van hanh ki va trien*.