Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
nhung cong » dung cong, thong cong, hang cong
hien sach » dien sach, kien sach, chieu sach
trung cua » truong cua, trung tuan, dung cua
trung cap » truong cao, trung tam
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan
phan tap » phan lap, han tap, pha tap

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)) - hanh ((trung cua) or (trung cap)) nhung cong tan phan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (thien hach)) - hanh ((trung cua) OR (trung cap)) nhung cong tan phan tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) or (thien hach)) - hanh ((trung cua) or (trung cap)) nhung cong tan phan tap*.