Perhaps you should try some spelling variations:
trien hoat » tien hoa
hoat huyen » hoa huyen, dat huyen, hoi huyen
sach trien » sach tien, sach tren, sach thieu
quy trinh » qua trinh, quy dinh
phan cung » phan cong, phan ung, phan xuong
phau cung » pha cung, phap cung, phan chung
kien phuc » kien thuc, bien phuc, thien phuc
phuc cac » phuc cam, phuc ca, phuc cham
cac khoa » cac khoan, cac khoi, dac khoa
tu sach » thu sach, su sach, te sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach trien hoat huyen đe ky thuat: kien phuc cac khoa ((phau cung) OR (phan cung)) quy trinh~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach trien hoat huyen đe ky thuat: kien phuc cac khoa ((phau cung) OR (phan cung)) quy trinh".
• Adding a wildcard symbol may retrieve word variants: tu sach trien hoat huyen đe ky thuat: kien phuc cac khoa ((phau cung) OR (phan cung)) quy trinh*.