Perhaps you should try some spelling variations:
thieu sach » chieu sach, hieu cach, theo sach
thien hach » thien thanh, hien hanh
thanh hang » thanh hoang, thanh thang, tranh hang
nhung cong » dung cong, thong cong, hang cong
hanh hang » hang hang, hanh han, hanh mang
cong vang » cong lang, cong quang, cong ngang
vang tan » van tan, tang tan, vang tao
tan cau » toan cau, van cau, tan ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sach) OR (thien hach)) - ((hanh hang) or (thanh hang)) va nhung cong vang tan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (thien hach)) - ((hanh hang) OR (thanh hang)) va nhung cong vang tan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) OR (thien hach)) - ((hanh hang) or (thanh hang)) va nhung cong vang tan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) OR (thien hach)) - ((hanh hang) or (thanh hang)) va nhung cong vang tan cau*.