Perhaps you should try some spelling variations:
dat tren » dat trong, dua tren
dau tren » dau tien, dau tieng, dau trong
nam xuat » nam luat, nam xua, pham xuat
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
te sach » toc sach
nang ro » nang co, nang ho, nang rong
nang ra » nang ma, lang ra, nang va
hieu ha » hieu hoa, hieu va, hieu ca

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 y ((nang ro) OR (nang ra)) hoi. hieu ha nam xuat va danh vi ((dau tren) or (dat tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang ro) OR (nang ra)) hoi. hieu ha nam xuat va danh vi ((dau tren) OR (dat tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((nang ro) OR (nang ra)) hoi. hieu ha nam xuat va danh vi ((dau tren) or (dat tren))".
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang ro) OR (nang ra)) hoi. hieu ha nam xuat va danh vi ((dau tren) or (dat tren))*.