Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, hang cong
hien sach » kien sach, chieu sach, vien bach
dien sach » dien anh
trinh va » trinh van, trinh vat, trinh ve
cong tan » cong tac, cong san, cong thanh
tan gian » tran gian, dan gian, van gian
gian cac » gian dan, gian cua

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 (dien sach))) or (thien hach)) - hanh trinh va nhung cong tan gian cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((hien sach) OR (dien sach))) OR (thien hach)) - hanh trinh va nhung cong tan gian cac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((((hien sach) OR (dien sach))) or (thien hach)) - hanh trinh va nhung cong tan gian cac".
• Adding a wildcard symbol may retrieve word variants: hoc ((((hien sach) OR (dien sach))) or (thien hach)) - hanh trinh va nhung cong tan gian cac*.