Perhaps you should try some spelling variations:
hieu hien » bieu hien, chieu chien, dieu khien
bach nuoc » bach tuoc, sach nuoc, bich ngoc
dieu hien » dieu khien, dieu kien, bieu hien
danh vai » danh sai, danh va, doanh van
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty ((nang ma) OR (tang ma)) hoi. ((hieu hien) or (dieu hien)) bach nuoc va danh vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty ((nang ma) OR (tang ma)) hoi. ((hieu hien) OR (dieu hien)) bach nuoc va danh vai cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty ((nang ma) OR (tang ma)) hoi. ((hieu hien) or (dieu hien)) bach nuoc va danh vai cua tu*".