Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hien sach » dien sach, kien sach, chieu sach
trung cua » truong cua, trung tuan, dung cua
trung cap » truong cao, trung tam
trong dan » trong dang, trong san, trong tan
dan chan » dan gian, dan ca, van chat
chan tap » han tap, phan tap, chan ta

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

• 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)) dung trong dan chan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sach) OR (thien hach)) - hanh ((trung cua) or (trung cap)) dung trong dan chan tap~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) OR (thien hach)) - hanh ((trung cua) or (trung cap)) dung trong dan chan tap*.