Perhaps you should try some spelling variations:
thuat xanh » thuat lanh, thuat canh, thuat nganh
tai thuat » tam thuat, giai thuat, ki thuat
xanh khoa » anh khoa, doanh khoa, nganh khoa
sach tai » sach bai, sach tham, sach dao
ke trung » le trung, he trung, ke trang
thuat la » thuat lap, thuat lay, thuat va
la khong » va khong, ta khong, ga khong
khong le » khong he, thong le, hong le
le trong » le trung, ly trong, le tang
tu sach » thu sach, su sach, te sach
khoa ke » khoan ke, khoa he, kha ke
sach ky » sac ky, sach y, sach ty

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 tai thuat xanh khoa ke trung ) or ( tu sach ky thuat la khong le trong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tai thuat xanh khoa ke trung ) OR ( tu sach ky thuat la khong le trong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tai thuat xanh khoa ke trung ) or ( tu sach ky thuat la khong le trong ))*.