Perhaps you should try some spelling variations:
day tieng » dau tieng, ban tieng, dau tien
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
va tieng » va tinh, tu tieng, va thong
ban hanh » ban hang
va cham » va chat, va tham
soc ban » hoc ban, coc ban, so ban
te sach » toc sach
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua

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 ty ((nang ma) or (nang x)) hoi. hieu va cham soc ban hanh tinh ((day tieng) OR (va tieng))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((nang ma) OR (nang x)) hoi. hieu va cham soc ban hanh tinh ((day tieng) OR (va tieng)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((nang ma) or (nang x)) hoi. hieu va cham soc ban hanh tinh ((day tieng) OR (va tieng))".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((nang ma) or (nang x)) hoi. hieu va cham soc ban hanh tinh ((day tieng) OR (va tieng))*.