Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
canh sinh » canh tinh, canh binh, tinh sinh
vat thong » va thong, vat trong, mat thong
cong toan » cong tan, cong hoan, cong tuan
he nhieu » hop nhieu, phu nhieu, he dieu
toan can » toan ban, toan cao, toan cau
can cau » van cau, ban cau, ca cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((he nhieu) or (hoc thieu)) tang - canh sinh vat thong cong toan can cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((he nhieu) OR (hoc thieu)) tang - canh sinh vat thong cong toan can cau*.