Perhaps you should try some spelling variations:
dinh dai » dinh dat, sinh dai, dinh dao
dan dinh » dang dinh, doan dinh, van dinh
thuc dan » thuc hanh, hoc dan, thuc vat
su sach » so sach, vu sach
vu cham » va cham, vu kham, tu cham
sang ma » nang ma, sang tao, mang may
tang ma » mang may, tang van
ve cam » ve cham, ve cac, va cam
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach _ ((sang ma) OR (tang ma)) hoi. hieu ((ve cam) or (vu cham)) thuc dan dinh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach _ ((sang ma) OR (tang ma)) hoi. hieu ((ve cam) OR (vu cham)) thuc dan dinh dai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach _ ((sang ma) OR (tang ma)) hoi. hieu ((ve cam) or (vu cham)) thuc dan dinh dai cua te*".