Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
manh trung » manh tung, thanh trung, manh hung
hien sach » dien sach, kien sach, chieu sach
trung qua » trung quan, trong qua, trung cua
dung cong » dung trong
cong vang » cong lang, cong quang, cong ngang
vang than » sang than, van than, cang thang
qua dung » quang dung, su dung, qua song
than cap » khan cap, thanh lap, thanh cac

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)) - manh trung qua dung cong vang than cap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sach) OR (thien hach)) - manh trung qua dung cong vang than cap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) OR (thien hach)) - manh trung qua dung cong vang than cap*.