Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
hanh lam » thanh lap, hanh kem, hanh va
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
su viet » so viet
k5 tang » ky tang, kho tang, 25 thang
va cham » va chat, va tham
lam su » lai su, lam so, lam vu
so anh » so sanh, so danh, do anh
ma hoi » mai hoi, ma hoa, me hoi
5 tang » 6 tang, 7 tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: so anh ((5 tang) or (k5 tang)) ((ma hoi) OR (xa hoi)). lieu va cham thuc dan hanh lam su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so anh ((5 tang) OR (k5 tang)) ((ma hoi) OR (xa hoi)). lieu va cham thuc dan hanh lam su viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so anh ((5 tang) or (k5 tang)) ((ma hoi) OR (xa hoi)). lieu va cham thuc dan hanh lam su viet*".