Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
cong phuong » cong thuong, cong huong, dong phuong
phuong thao » phuong phap, phuong thuc
thieu sang » chieu sang, thieu quang, hieu lang
thao tuan » than tuan, thanh tuan, tran tuan
manh cua » doanh cua
tuan cau » toan cau, quan cau, tuan cu
ban cua » ban quan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sang) or (thieu khang)) - hanh ((manh cua) OR (ban cua)) cong phuong thao tuan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thieu khang)) - hanh ((manh cua) OR (ban cua)) cong phuong thao tuan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (thieu khang)) - hanh ((manh cua) OR (ban cua)) cong phuong thao tuan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (thieu khang)) - hanh ((manh cua) OR (ban cua)) cong phuong thao tuan cau*.