Perhaps you should try some spelling variations:
sach nganh » sach ngan, sach tranh, cac nganh
thuat lanh » thuat lap, thuat san
lanh kinh » anh kinh, lanh dinh, thanh kinh
kinh mach » tinh mach, trinh mach, tinh cach
mach khi » manh khai, mach vi, cac khi
te sach » toc sach
mac khi » cac khi, cac khoi, mac phai

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te sach nganh mac khi đong luc ) or ( thuat lanh kinh mach khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach nganh mac khi đong luc ) OR ( thuat lanh kinh mach khi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( te sach nganh mac khi đong luc ) or ( thuat lanh kinh mach khi đong luc ))*.