Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
nhung tung » nhung tuong, nhung dung, nhung vung
hien sach » dien sach, kien sach, chieu sach
quang cua » quan cua, quang tuan, quang huy
cua nhung » va nhung
tung dan » dung dan, huong dan, trung dai
than tap » han tap, phan tap, than cap
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien sach) or (thien hach)) - nhanh quang cua nhung tung dan ((than tap) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (thien hach)) - nhanh quang cua nhung tung dan ((than tap) OR (toan tap))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sach) or (thien hach)) - nhanh quang cua nhung tung dan ((than tap) OR (toan tap))*".